The good: sleek look. Minimal functions means minimal learning curve. 1.3" (45mm) face, metal shell. Durable buttons. Durable bands. Waterproof - (the manual suggests it's not salt water proof, and I haven't tested that yet). I shower with it on and have had no problems yet. Long battery life: to clarify: the watch will remain on for 11 days with all-day use, but in those last 48 hours or so, the battery will be too weak to support any function other than the clock. It only takes 3 or 4 hours to charge the watch. Functions: heart rate monitor, stopwatch, timer, sport modes: you tell the watch when you're beginning exercise (walk, run, bike, or swim) and it times you and calculates your workout. When not in sport mode, the watch will still track your steps and calories, but it doesn't know if you're exercising or not. There are 2 buttons on either side of the watch. You can customize one to be a shortcut to one of thew sport modes. Heart rate monitor: the best way to use this function is to put the watch on the inside of your wrist where your pulse is strongest. Even in that position, the heart rate function Isn't incredibly accurate. In the app, you can set your resting and target heart rates which will improve its accuracy. Sleep tracker: the watch detects when you're in deep sleep and light sleep, but the data is stored in the app on your phone - meaning you won't see any info on your watch. Texts and calls: the watch can let you read incoming texts (not MMS, photos, or emojis), and also see incoming calls, and will allow you to decline a call to stop the phone from ringing. But you can't reply to texts nor answer the phone using your watch. In the app on your phone, you can turn on/off the ability to get texts and see incoming calls on your watch.Phone locater: There's a menu on the watch that allows you to turn on/off functions: heart monitor, Do Not Disturb (DND), Rotate Sensor (on means that the watch will wake up when you rotate your wrist; off means it'll remain asleep until you push a button), and Find My Phone. In the app on your phone, you can turn on/off the Find My Phone option. If you have it on and you select it on your watch, your phone will ring - even if in DND or on vibrate or silent!Music player: there are no speakers on the watch, so the music player function is simply a remote control for your phone. In the app, you can designate which music app you want the watch to control. The charging cable is a USB charger, which is nice. The side that connects to the watch is easy to use and the watch snaps into place nicely. The app has a lot of useful functions to help suit the watch to your needs. There's even a woman's menstrual cycle tracker - if you enable it from the app.The downside: not customizable. You can't add apps to the watch and you can't rearrange the icons or submenus. Screen protectors are hard to find and because of the curved edges of the screen, the most suitable ones won't cover the entire surface of the watch. I think my next smart watch will be a round face one bc those screen protecters are easier to find, and I don't think the round watches have a beveled/rounded edge. The charging cord is only about 12" from end-to-end. The watch is slow to wake up when you turn your wrist to see what time it is. Screen brightness: you can only choose from 3 levels of brightness.No "always on" display. There's no way to keep the watch from going to sleep - even if you're using the timer or stopwatch function.