Bear in mind this review comes from my one day of ownership. The watch looks extremely nice, and has a lot of features: the screen is very clear and detailed. It synced up easily with my phone, and has message notifications, phone rings, etc. Very nice indeed.
On the downside, the step counter is under counting my steps by 20-25%, and the heart rate monitor is unreliable (measured my actual resting heart rate of 56BPM as 84 BPM) if you wear the watch face outwards (as most people do). If I wear it in the far less common aviator style (face inwards), then it does accurately measure my heart rate.
I haven't used many of the other functions, but it has a lot. I think it's very good value at the $35 price point I paid (despite the issues above), but I'd be annoyed if I paid the indicated full retail of $150.