I have the GoPro HD. Here's my initial observations based on the specs/features on the website:
The remote control and LCD preview/playback screen would definitely be useful. The GoPro is pretty much point-and-pray. I'd love to be able to line up a shot without recording a sample video, hooking up to a TV/computer to see the results, then adjust the mount, rinse and repeat. There is supposed to be an add-on LCD screen for the GoPro at some point. The Drift will still have the huge advantage of viewing/changing settings on an LCD display with a more proper menu compared the nore tedious and cryptic settings menu on the GoPro.
The zoom on the Drift is digital and only available when recording at resolutions less than 1080p. I wouldn't consider this much of a feature, because digital zoom rarely looks good enough to use (you can get the same/better effect using video editing software to scale the video larger).
The Drift has a rotating lens so you can always make sure that the video is right-side-up no matter how the camera is mounted. With the GoPro, you must find a way to mount the camera as close to perfectly vertical as possible. The GoPro does at least have an upside-down mode.
The Drift is waterproof to only 0.5m. GoPro is waterproof to 60 meters (although it's the mounting case that's waterproof; not the camera itself). The Drift can pretty much only safely get wet, but not really go underwater. The GoPro can go underwater with you snorkeling or scuba diving, or just playing around in a pool or lake.
GoPro can record 60fps at 720p (insanely smooth video, or regular smoothness when slowed down to half speed). Drift only records at 30fps.
GoPro comes with an awesome high-strength suction cup mount (the motorsports version does, at least). I use this mount more than any other because it's just so easy to use and doesn't leave any mounting pieces semi-permanently stuck to something. I didn't see a mention of a suction cup mount for the Drift.
As usual, neither one a is a clear winner, both see to be good products. Get one of each?
Then again, the GoPro will be able to record 3D video soon
https://www.bustedknucklefilms.com/news/gopro3d/
I can't find it now, but I'm pretty sure the 3D kit will include a cable that hooks the 2 cameras together and synchronizes the start/stop of recording, contrary to what the linked article says.
