It's exactly what I wanted in a watch. Tracks my steps, sleep, Hart rate, outdoor and indoor bike measurements, and sends text and incoming call notifications. The best part is that I only have to charge once every two to three weeks.
Had this for a few weeks now and I'm quite impressed. This is a tremendous watch. I'm more of a runner, but do bike frequently. The GPS works extremely well compared to watches I've used in the past. I've also toyed around with the bike mode and it also seems to be quite accurate for what it is (bike is currently out of commission so don't have as much experience). The smart notifications are also nice to have. Many of the functions I will never use but there seems to be something for everyone. The built-in heart rate monitor can be a little spotty. I'm excited to try this with one of the Garmin heart rate straps to gain more accurate data (hopefully). My only gripe would be the size and battery life. The battery life really probably isn't as big of a concern considering I usually have it connected to my phone. The size was a bigger hurdle however. Took me a while to get used to it, but for such a big watch it does carry itself well. Just ran ten miles with it and I didn't feel like I had all that watch there. Overall I'm really happy with it. People with small wrists would probably not appreciate the size of it, but for me (6 foot, 155 pounds) it doesn't bother me enough to not use it.
The real review would be on DC Rainmaker's site (of course).
However, being able to correlate how you feel during the day with sleep quality is a nice touch.
Additionally, following your resting heart rate trend ( to get a baseline) and compare that with morning trends as your workload increases is a nice tool to help evaluate over-training states.