Honestly I don't even feel the two are competing products. GoPro for sure unless you are really tight on cash :thumbup:
Care to qualify that statement?
I own both a Contour GPS and a Contour+, and have found them very easy to use and mount. Both have the ability to be used with a smart phone (iPhone or Android, the latter being my personal choice), which allows you to use the phone as a range finder and change settings on the fly.
The reason I personally went for the Contour is because of the GPS feature (although you may want to turn this off if filming for public use if you know what I'm saying

), the bluetooth connectivity feature, and the general size and shape of the camera. The Contours are definitely easier to fix to your helmet than the GoPro without sticking out in a major way.
The Contour+ also has a dedicated mic input, which will let you place a mic inside your helmet for instance, which I'm glad I did because when I went to Sweden to drive a Formula 1 car, I wouldn't have been able to hear a thing except wind noise. As it is, I was able to capture the roar of a 550BHP V8 screaming at 14K RPM, teasers of which you can all see
here.
To my mind, the GPS feature alone makes the Contour all worth it. The shape of the camera further adds to the experience in that it is much less obtrusive when mounted on the bike or on your helmet. Finally, the bluetooth connectivity enabling a smartphone to be used as a rangefinder that also lets you change settings on the fly clinches it for me.
My two cents.
Now if only my shop wouldn't have dropped my bike I'd go out and do some sample runs for you all. Oh well, 14 more days until the new tank arrives.
Might head out on the FZ1 they've lent me in the mean time, though.
Cheers,
Martin