Easy to assemble, approximately 80 minutes. Easy to follow instructions and tools are included. Majority of screws (12) are already inserted in place so you won't have to sort and match. Also easy to move with built in rollers.
Quality of bike is what I expected for the price and reading the reviews. Not like gym quality but close enough and priced right. Quite and smooth, also easy to program and use. In fact, ten minutes after assembling I was using it and 45 minutes later I was sweaty and tired!
Update review after 16 months of use.
The bike has held up better then I expected. I use the bike almost everyday for a average of one hour a day and as long as 3 hours. It's still as quiet and smooth as the first time I used it, the only maintenance that I perform on it is wiping it off with a paper towel and Windex. I've lost a total of 25 pounds since purchasing it and in combination with my Apple Watch, witch I use the bike to close my exercise and move rings and complete monthly challenges.
Highly recommend and 100% would purchase again.

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.

I picked this up recently to add to my home gym setup.

Setting up the bike was pretty simple and straight forward. All the tools to set it up are included in the box, but I did grab my own tools for attaching the seat, pedals, and console. The tool included would have worked, but my tools were more efficient and comfortable to use. Overall, the setup took about 30 minutes. I probably could have used an extra set of hands when it came to attaching cables then attaching parts that contain said cables, but it was certainly doable on my own.

Using the bike is what I expected. There is very little noise from the bike. The fan is a nice feature, though it does smell like new plastic - I hope that goes away fairly quickly. Everything is pretty straight forward. The setup process starts up when your first power the bike and is fairly intuitive (though, there are instructions in case you have questions). While working out the bike works fine. It is fairly sturdy, though, you could knock it over if you really tried, but I have no concerns with tipping or even ricking while using it.

The only thing that kind of let me down was the bluetooth functions:
-First off, you can't connect your phone to the speakers via bluetooth (as far as I can tell). This isn't a huge deal to me since I connect my phone to my TV in my workout space and I suspect the speakers are really that good on the bike.
-When you sync your rides to your phone, the time is not accurate. This wouldn't be a big deal, except I record my workouts from my apple watch. Normally, Apple would recognize the workout and the imported ride as the same event, but since the time imports incorrectly, 2 separate workouts record - that is pretty annoying and defeats the purpose of the apple health integration (also, you can't edit the time for the workout in Nautilus or Apple software - you think the console would be smart enough to record the correct time since the time is setup on the bike).

If I had known that the bluetooth integration would be as frustrating as it is, I would have purchased the cheaper U614.

Works as advertised.Very adjustable,used by three household members.Wish I used it more.

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.