Note: I have had the watch for about a week.
I would make a Pros&Cons list because it's really not that black and white.
The accuracy is weirdly inconsistent in some areas and somewhat better in other ones.

- Heart Rate: (7/10) I heard a lot of not-so-great reviews in regards to the heart rate monitor, and well, it's true. But if you're not in a dire need of the best of the best heart rate tracking technology then maybe any sort of wrist-worn HR tracker isn't for you. (Or get an Apple Watch)
- Step Counter: (5/10) The steps are crazy off. Sometimes there's a delay in recognizing the steps but sometimes they just don't register. There have been times where it would register steps while I'm sitting or even laying down.
- Calories Burned Tracker: (?/10) I really can't say how accurate or inaccurate this is. As far as I am aware most wrist-worn fitness trackers are not really accurate when it comes to tracking this in particular so I'll assume it's not very accurate.
- Sleep tracking: (7/10) This right here is really interesting. The very first night, it did very poorly in tracking my sleep. It said I woke up hours earlier than I actually did and it has done this another 3 times since then. But, and I do mean BUT, it has an interesting feature where you can edit the sleep times (through the app) and has an option to fill in that edited data with sleep data. I can't really say if the filled-in data is accurate or not, but I do believe it's better than having just empty data. I also believe that it takes time for the watch to get used to YOU and your sleeping habits. I've noticed more believable data the more nights I've worn it (even the filled-in data).

Conclusion: Overall I do not regret the purchase, BUT it is a little pricey. I would've felt more comfortable with the price being closer to $125. I believe this could be a watch for people who aren't really interested in fast and accurate data, but more so for the casual crowd of folks who need to see minimal data during their workouts and runs.
Overall Rating: (7/10)

UPDATE: After four months of use, I still really like this watch. However, it has gotten quite scratched. Make sure you get a screen protector. The sleep data has gotten less accurate. It does a great job of tracking your sleep... if you don't wake up in the middle of the night. I have also noticed that the time between charges has slipped slightly. Not much, maybe a couple of days, but it is noticeable. One more thing to note is that you have to reset the time on the analog watched her you charge it. Not a big deal, but noteworthy. I still really love this watch and get compliments on it often.

I absolutely love this watch. It has all the features I was looking for, but looks fantastic. The app is very useful and easy to use. However, the charger is cheaply made junk.
The watch itself is solidly made and initial set up was easy. The battery life is great. Definitely 20+ days. The strap that comes with it is silicone, which I didn't think I would like, but it has grown on me over time. I like that I can pop it off, wash it, and pop it back on. The black watch face that I got is a bit hard to read sometimes, but not terrible. I can always push the button to see the digital time. Features I like: heart rate, activity tracking, sleep tracking (didn't think I would use this, but I really like it). Features that I don't use: calories burned, alarm. The slight vibration for notifications is really useful for me since I am a teacher. I can glance at it quickly to see if I need to excuse myself, or can ignore it. I actually prefer that I can't reply from the watch. I see a lot of others that have that option and it is distracting for them.
The app itself is very useful. I really like the setup of the dashboard and the timeline. There is a LOT of information inside the app, as well. It also syncs with My Fitness Pal very well. I use the reminders to help me remember to take vitamins and hop on the scale. I have lost a bit of weight since getting the app, and I find the data trends inspiring. One note: I have had to re-pair my device a couple of times. And you DO have to have your phone with you to use some of the features, like GPS. This isn't a problem for me, since my phone is usually in my pocket when I go for a walk, or on my desk, nearby, when I am at home or work.
The charger: it worked really well... the first time. When my watch got to about 30%, I tried to charge it. It got to about 45% and stopped charging. I knew it was the charger, it took a while to convince customer service of this at Withings. I had to purchase an extra charger (which I wanted anyway, but still) to prove that it wasn't a hardware issue with the watch and that I didn't need to return the watch itself. However, after all of that, they are shipping me a new charger.
Overall, I really like the watch and the app. They are both easy to use and motivating. The charger is junk. Buy a backup if you find that the watch isn't charging.

I bought this watch in April 2019 (about 14 months ago). I was looking for something that could count steps and other fitness functions. I personally found Fitbits, Apple Watches and other smart watches to be eye sores. I wanted something that looked like a watch that I could wear casually and professionally. I bought the black 40mm version. Note that I was never interested in reading texts through the watch, so this is a function I have no experience in.

Pros:
- The watch is handsome. What you see in the image advertisements and customer images is what you get. This won't compare to high end watches, but I like it.
- The battery life is incredible. If you don't use the text function (hooking your phone up to the watch via bluetooth and reading texts) the watch can easily last multiple weeks. After a few hours of charging the watch can last 4-6 weeks with daily use, if not longer.
- While I don't wear the watch while running or exercising, I've sweat quite a bit while wearing it. It's easy to clean and seems well built.
- I'm pretty active, so I like the visual pedometer on the bottom of the watch. At a quick glance I can see the amount of steps I have for the day in a stylish form.
- The button on the side can show a variety of information, including the date, steps, heart rate and others.
- The app is pretty simple and straightforward.
- After over a year I have no visible damage to the watch. It looks near mint.

Cons:
- The minute and hour ticks are very faint. Upon a quick glance you may not be able to read the watch. You will have to get accustomed to the position of the minute and hour hands to read the time and not depend on the ticks. The other styles appear more visual based on the images provided by Amazon.
- The glass screen is bubbled above the metal border, which allows it to get bumped and scratched. I still have no scratches, but if you were in a very physical environment I would be concerned it could scratch.
- The pedometer is not perfect but appears relatively close. I tested this watch with my Fitbit Charge 2 and it seems like the Withings watch registers about 75% of the steps that the Fitbit registers. The Fitbit seems to over-register and the Withings may under-register. The truth is probably somewhere in-between.

Overall, if you are looking for a simple-looking watch that has many of the same functions as a Fitbit with an incredible battery I would strongly recommend buying this. You'll be hard pressed to find a watch with similar features at this price.

The watched arrived promptly. I immediately charged it and updated the software. I ordered the limited blue (not the sapphire blue, which has a brown band). It came with a plastic sport band and a blue leather band. Both look great, but the sport band is more comfortable at the moment. It looks gorgeous, and I get compliments on it everywhere I go. People cannot believe it is a smartwatch. I was having trouble deciding between the Steel and the Steel HR. I didn't like all of the features included in traditional smartwatches, but I liked the idea of a fitness tracker that would buzz me when my phone rang. I currently use a Fitbit Flex 2, but it only lasts for 3-5 days at a time. I always forget to put it back on after I charge it. I was intrigued by the battery life of the Steel. But ultimately, I wanted the phone notifications, which are only available on the Steel HR. There is a promise of a 25 day battery life, which I think assumes that you have no alarms or notifications. After one day, I'm at 92% battery. So I think I can expect this sucker to last about ten days to two weeks. Still impressive for a smartwatch. I also think that once you hit the end of its battery life, it has some reserve power to keep the timepiece going. If you're looking for something with all of the features of an Apple Watch, keep looking. But I don't care about checking my email, paying, etc. from a watch.

Fitness Tracking. I like the step tracking. However, there are complaints about its accuracy. I wore my Fitbit on the same wrist as the Steel HR to see if they matched. I also kept a close eye on my Samsung Health tracker in my phone (which just meant I couldn't leave my phone on my desk). They were all different, but the two closest to each other were the Withings and my Phone (about 5% difference). The fitbit was about 10% off from the others. That's good enough for me. The smaller dial with the percentage tracking is helpful. Once I set my goal in the app, it does the math for me.

Heart Rate. The HR tracking appears accurate. The bummer is that it doesn't appear that the software/app takes the HR into account when calculating calories burned. That is disappointing, but not a deal breaker for me, as I usually track my activities in MyFitnessPal. I also participate in athletic activities that require me to take my watch off, so those have to be manually added anyways. But being able to see my average heart rate during a workout session allows me to use the Runtastic calculator to come up with calories burn in the activity, which I then plug into MFP.

Sleep Tracking. My fitbit and Steel HR matched very closely in terms of sleep tracking. Both had the same start and end time. The Steel HR picked up some awake time that the fitbit didn't "“ probably because of the heart rate change, as I didn't get out of bed. And both said I got terrible sleep, so that's accurate. I read some other reviews with complaints about how the Steel HR cannot tell the difference between you lying in bed reading and being in a light sleep. I'm not sure what people expect from a watch. If you have a low heart rate and you aren't moving, you cannot be mad at the watch for thinking you're asleep.

Watch Face/Screen. I wish the hands and numbers were luminescent. And I think that with the Steel, this would be a problem. But with the Steel HR, pressing the crown will bring up the date and time, so you can check the time in the dark. It would be nice if Withings incorporated luminescent hands and numbers into its later versions.

Notifications. The vibration for notifications is pretty strong. The screen scrolls with either a phone or a message bubble (call or text) along with the caller/sender name, followed by the text of the text message. That latter feature "“ the scrolling text of the message "“ is pretty neat. So far I've only noticed one message that I didn't feel the vibration. I think it's because I had the text conversation open on my phone at the time.

Alarms. The alarm mildly woke me up, but I definitely wouldn't use it as my primary alarm. It's too easy to switch off, and with no snooze, you'll have to set multiple alarms to be safe. Luckily you can set more than one (three I think?). But using this function surely shortens battery life, so I might turn it off.

Overall, I'm pleased with my purchase so far. It's a gorgeous watch with features that I'll actually use.

I'll update once I have more data to pull from (particular regarding durability and battery life).

After a few weeks the band started to tear and i havent been able to find a decent replacement yet