This is a pretty fancy watch/ health tracker. This is my first, and so I am still getting used to it, but so far so good. This band tells the time, heart rate, daily steps, stress level, and tracks your sleep. You can adjust the brightness of the face and change it's appearance to suit your style.
This band links in with your smart phone, thankfully I have a Samsung phone so it was easy for me.
The band holds a charge for quite a few days and magnetically gets held on the charger. Band is comfortable to wear. The health app works well and is easy to read and understand.

This is a tiny little thing to spend a hundred bucks on, but there's a lot of tech packed inside.

The quality of construction is quite nice; if you're comparing any of the knock off brands that market similar 'smart' watches, you will quickly see a world of difference. The strap as well as the watch itself are well put together. The gorilla glass is durable and the AMOLED means you can see it easily on a bright day without having to find a very specific angle in the shade to see what it is trying to display. All of this and I haven't mentioned the functionality. The touch screen works flawlessly and the near limitless amount of widgets means that you can customize this to your heart's content, (and then change it up the next day if your mood changes). All of the little things just work, including the heart rate monitor, the connectivity and the auto-pause. This really becomes transparent in use; it is the polar opposite of frustrating.

The water lock setting works well for shower/pool; doesn't keep turning on with false positives.

I thought this would be cool for workouts and just nice to have all around. Turns out I like it way more then I expected to. I have tiny wrists and it fits! I love that you can switch out the bands for other color options. I don't like having the volume on my phone on especially not while at work. I love that it feel it vibrate every time and can quickly check it without it being a clear distraction like a phone in your hand at work is.

The watch is a solid little fitness tracker. Appears to be very accurate with steps and heart rate.
You can use the app to add in widgets for stop watch, water intake, caffeine intake, sleep tracking etc, to customize the watch for the way you will be using it.
The watch has a find my phone feature, and alternatively the phone app has a find my watch feature. So you’re good to go as long as you don’t lose both at the same time.
The battery life with all features and tracking active lasts 1.5 to 2 days which is reasonable.
Strap is adjustable and comfortable.
Looks nice, display is simple but perfect for the style and what you use it for. So far so good, no real complaints.

This is a great watch with lots of information for you. The apps for this have a wonderful and easy way to count calories, determines your sleep pattern, has maps of the trails you walk and many more ways to arrive at a great way to see your overall condition. Definitely would purchase this again.