I've got 2 x Drift Ghosts, a Drift HD, and a GoPro Hero 2.
The earlier Drifts and GoPro's were susceptible to artifacts (small purple pixel appearing in brightly lit scenes).
I decided to stick with the Drift for a couple of reasons:
- No case necessary for any weather. They're weatherproof out of the box (cases are available for complete submersion).
- Much more streamlined on your lid. I just don't like the look of the GoPro "brick" hanging off the helmet.
- They were first to come out with non-cryptic menus. It's intuitive. I understand the later GoPros have English menus.
- I like the ability to plug in a mic cable or power into an auxiliary waterproof plug receptacle on the back of the Drift. Had to drill a hole in my GoPro case to do the same.
I think video quality-wise, they're very similar. Of course the Ghost is newer tech than the older Hero 2, so it doesn't artifact, and it's better in low-light and bright-light tempering. The Ghost breaks files into 4Gb chunks. Not sure what the newer Heros do. I have no use for 4k resolution (waaaaaay too big files). The Ghost also has multiple field of views (127° and 190°) at different res, so you can set it so your helmet isn't blocking half the shot, when mounted on the side.
This was shot at Deal's Gap in May on the Drift Ghost:
The Dragon - VStrom rally - YouTube
This was shot on a dam near me, in Atlanta, with the Drift HD mounted on my lid, and the Hero mounted on the handlebar for comparison. To be fair, the windshield is a slight smoke on that bike.
Buford Dam - Georgia - YouTube
Make sure to set the res to the highest when you watch for a fair comparison (small gear symbol lower right corner of the YouTube screen).