I'd always used the commercial grade LifeFitness LifeCycles at the gym for perhaps 30 years. I always liked the programs and smooth resistance. So I wanted the same thing at home but without the commercial price. I've had it about a month now and am enjoying it, not burning to a crisp in the intense Texas sun.

The Nautilus U616 has an easy to use electronic interface and programs just like the LifeCycles you find at the gym and it will store your results once you've created your own user profile. You can output to a USB stick. It tracks all the usual stats like distance, speed, cadence, calories, heart rate and tells you what zone you are performing in like fat burn, aerobic, anaerobic, etc. I couldn't get my Android Phone to connect though to use the 3 free ride videos they offer. Many have said it only works with Apple phones. No big loss as I can put on a you tube video of the thousands of uploaded rides all over the world and ride in the Alps or deserts or anywhere else and just press the + or - button to change resistance for when the video is climbing, descending and riding flat. No need to waste money subscribing to those mothly workout class services.

It's lightweight so homeowners can move it around for space savings. What that boils down to is that it will never be as sturdy and solid feeling as a commercial unit but it is durable enough to handle what a weekend warrior MTB rider can put out. It's pretty stable but you can tell it isn't as rigid as a commercial unit but I can't complain because I know I'm not going to be able to break it. It's sturdy enough IMO. The seat is probably fine for a woman because of the shape but as a man, something narrower was needed so I replaced it. Also the weighted pedals and rubber staps had to go. I put on a set of cheap SPD/platform pedals with toe staps. My wife uses the platform and cinch strap side and I have the SPD shoes so I can spin properly. The bars do not adjust up and down for height. Only the angle of the bars can be changed and they are fine for roadies as they are shaped like aero/endurance bars. For us MTB people, it would be nice to have a wider flat bar style that's a little higher. But no one makes those for these bikes so it's moot. I can fabricate something like this easily. The built in fan is kind of useless. It's mounted too low and can hit your neck at best but mostly only your chest. I bought a USB powered clip-on fan because the U616 has a USB input and I mounted it to the top of the display. Problem solved.

I only paid $430 on sale and I feel that the U616 is every bit as functional as the LifeCycles at the gym. Even if I had a LifeCycle brand, I would still replace the seat and peadals and mount a fan, so the mods I did are a wash. The programs are the same style, maybe the Nautilus has more. I never had any intention of subscribing to those streaming workout services so I'm not bothered that my android phone didn't connect to it. Maybe if I had a better phone it would but I refuse to pay over $200 for a phone. Phones are not important to me. However for those that do love their phones, you can stream music and the Nautilus has built in speakers.

I would buy this again without hesitation.

Only one week review. Took some time to get the app to work. Assembly was easy and instructions were clear.
The visual tours are limited to 6 locations and additional locations are available for a fee. You need to run the app to get your workout recorded. As some have reported the seat is pretty uncomfortable but it is set on a typical bike post so you could purchase a different seat of your liking. The adjustments for the seat forward and back and up and down are excellent.
The resistance of the pedals are also smooth and automatically change based on your program settings.
The heart monitor does not work but I have yet to contact Nautilus regarding this. Overall I'm very happy with the unit for $350.00, and getting an aerobic workout in the middle of winter without leaving the house is well worth the investment.

I have always wanted an at-home exercise option (I use my gym membership religiously) and just didn't think I had room for anything in my small home. Public gyms getting closed due to COVID-19 caused me to take a second look. After much research I settled on the Nautilus U616. It fits perfectly in the corner of my spare room. Due to the tires on the front end, I can easily roll it to my living room where the TV is, and then roll it back when I'm done working out.

Because I'm used to commercial-grade equipment, I wanted a sturdy machine that had many levels of resistance that I wouldn't be able to max out (I am not a beginner when it comes to working out. I've been doing so for years and may legs are strong). I am beyond pleased with my purchase. The bike is VERY quiet and sturdy. I get an excellent workout and I'll never be able to max out the levels of resistance (not even close) which makes me happy. After I took the bike out for its maiden voyage, I did discover that I didn't have everything tightened down like I thought I had. So I tightened everything up after my first ride and my second ride was just fine.

Putting it together wasn't too bad (I was able to do it by myself) but the instructions were horribly inadequate when it came time to wire and install the console. Thank goodness for the guy who had the same problem I did and made a YouTube video. That saved me. Otherwise putting it together wasn't terrible. It took about 90 minutes or so. Also, a screwdriver/wrench combo tool is included with the parts. It mostly did the job except for when it came time to put on the seat. I went and found my socket wrench for that. If I had to rely on the included tool, I'd still be sitting there trying to tighten down the seat bolts. If you have your own wrench set you will also probably appreciate it for tightening up the pedals.

Other reviewers have talked about the seat. It's not the most comfortable seat I've ever sat on but it's not the worst either. It will do for now. After I've had the bike for a bit I'll see if I want to swap out the seat or not.

When I initially ordered the bike on 3/24/20, I was given a delivery date of 4/24/20 (I live in Alaska). Thankfully the bike showed up 22 days early. I'm extremely pleased I didn't have to wait a month especially given the circumstances of home isolation/quarantine right now.

You get what you pay for. I knew I would not be pleased with a $100 fold-up bike. I needed quality and this is it.

This is a good exercise bicycle. So far it seems very solid and has performed well. Putting the bicycle together was fairly straightforward and took me about an hour. The seat is very firm. I would definitely consider getting something more padded as a replacement seat. I like the bike and have been riding it daily as it came. However the software to connect your phone or device is weak. The free software is limited to a handful of video tours. They were pleasing to watch though. My biggest complaint in regard to the software was the difficulty getting it to update my phone with my workouts because I am trying to track and log my workouts. It does do it but the instructions are lacking clarity and the method in which it updates is not as expected from experience with other apps of this type.

Very pleased so far. The package arrived on time and in good condition. It was packed in a very orderly fashion, easy to identify small loose parts. Ships with custom tools for assembly - the instructions correctly recommend only to provide a utility knife and scissors for unpacking.

The assembled unit is extremely quiet. The loudest sound comes from the surprisingly effective rider cooling fan mounted in the display console. This can be aimed up or down separately from the adjustable console tilt.

Ergonomics are very good. I am 6' 4" tall and had no trouble adjusting for comfortable leg extension. The seat is fairly comfy, but it is replaceable with any standard bicycle seat to suit the rider. Also, it adjusts not only up/down but also fore/aft, and feels quite secure under my 265 lbs.

The display console mast wiggles just a bit in its base socket, but this does not appear to be a significant mechanical weakness.

The pedals and their included straps are large enough for my Size 16 shoes and feel quite secure. These may also be replaceable with standard bike pedals for those riders needing something specific (shoe locks, etc).

The included wireless heart rate sensor is an ECG Chest Strap type. It suffers from the problems which all such units (as well as handlebar contacts) have relating to electrical contact with the skin, signal noise from "muscle artifacts", electrical interference, etc. I find that after I've worked up a good continuous sweat, the HR readings become steady and reliable. Also, one could use medical-grade ECG probe contact conductivity grease with the chest strap to improve the signal reliability.

The instructions indicate that the display console can receive wireless HR signals from some Polar sensors. I have 2 Polar sensors (one ECG chest strap, on optical arm band), but the display console does not recognize either of them. In general, I find that my Polar optical arm band sensor is by far the best - it is stable and reliable, and does not depend on sweat or moisture to maintain proper connectivity. It would be nice if this exercycle could recognize it.

The display console does a pretty good job of setting up resistance and HR ranges based on user input of height, weight, age, and gender. This feature tracks my Polar fitness app figures fairly closely. The console allows for separate profile setups for up to 4 different users.

The pedal resistance is very smooth. The unit only has a small flywheel, so "accelerating" (increasing pedal RPM) doesn't feel quite like a real bicycle, but I quickly stopped noticing the difference.

As on all exercycles, the display values for "Speed" and "Distance" are arbitrary. Compared to my real bicycle, these numbers come up higher than out on the road. It would be nice if the display console setup allowed for configurable scaling of these display parameters.

The available pedal resistance range seems reasonable. I've started off with a resistance setting of 9 (out of 25), which gives me a nice easy "cruise ride" with HR around 120. The "Intensity" bargraph on the upper display comes up at about 40%, and the HR bargraph on the right at about 70%. My actual maximum HR is somewhat higher than the recommended "220 Minus Age" value - I wish this parameter could be customized to my actual value. The "Intensity" bargraph does recognize pedal RPM increase as well as resistance increase.

The arrangement of the display console is nice - the "split display" feature allows me to use my smartphone with the Polar fitness app for HR, calories, etc, in place of the "upper" display, but still see the times, RPM, etc on the lower display. I have not tried the on-board data logging feature (dump to USB drive), because I like to keep all my fitness data in a single general-purpose app on my smartphone. I also have not tried the recommended Nautilus fitness app for my smartphone.

All in all, I can highly recommend this exercycle - it is so convenient having it always set up and available. No more scheduling qym trips, road traffic, weather, or outdoor air pollution to deal with.