For an alternate opinion, I bought the Drift X170 (predates the HD version) and was initially happy. Coming from a DIY helmet cam setup and then a GoPro, I really like the ease of use, remote, and LCD screen although the X170 ate batteries.
The only reason I wouldn't go with Drift again is because of customer support. My video continually had periodic black flashes (like an exposure issue) and while my initial contact with Drift received a response, they pretty much ignored me after that and my problem was left unresolved. I sent them snippets of raw video to examine, and played around with different exposure settings and such, but all I got was one response telling me to upgrade my firmware (which didn't fix the issue).
To some this may seem petty but I had hours of epic backcountry video from Rogers Pass and Revelstoke that I can't do anything with. Admittedly I can't blame Drift for that as I should've tested the new firmware before heading out. However, I can hold to the fact that they didn't support me and left me with a useless camera system.
It is great to see more offerings on the sports camera front though, and I'm sure we'll see improvements and more innovation each year.