I got this for my husband. This is his review:The band is fairly comfortable. I have a pretty large wrist, 9" (22.5cm), and this band fits using the very last hole. The black silicon band has a little give so even my wrist has a little "wiggle room" to move around slightly.Setup was straight forward. The unit includes a magnetic charging pigtail with a USB A plug on it. My unit came with a little charge on it but I left it charging for a while before use to avoid possible complications during setup. Of course, like most things these days, you have to use their app to get it working correctly. The app is easy to find and download with the included QR code.Controls are pretty easy to understand once you have gone through the instructions. There is only one button but it has several functions. Many of the features are dependent on pairing with a cell phone. This pairing is all done through the app. Do not try to pair it through your device's bluetooth menu or it gets confused.First, there are several watch faces to choose from, many free and some paid. Everything from flashy and artistic to plain and simple. They also show a wide variety of data sets depending on your preferences, of course date/time, hands vs digital, battery level, health, weather, steps, etc.A lot of the functionality is geared toward health. Heart rate monitoring, blood oxygen, exercise tracking, step counting, sleep monitoring, stress monitoring, noise monitoring, activity monitoring, sedentary monitoring, breath training, and monitor monitoring (okay, I made that one up). The heart rate monitor is pretty accurate considering the numbers matched up with my dedicated Wahoo heart monitor.There are far too many functions to cover them all here but I will mention some of my favorites. Music control, send/receive calls, flashlight and timer. What I like the most though, is calendar notifications. If you set thing up correctly you can have the watch vibrate (or audible if you wish) to remind you of thing you put in your calendar (iCal on my phone).All-in-all, I like this watch and intend on getting a lot of use out of it.