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.