I use go pro's on a daily basis for work.
We have alot of people using contours and I havnt really heard good things
The gopro is just so simple, 2 buttons, awesome quality (especially on the go pro2) and an MP4 file stored on a standard SD card ready to drag and drop onto your desktop in a matter of minutes. No file conversion necessary.
The go pro 1 picture quality is good, light and dark contrasts it will struggle with.
The gopro 2 is better with this contrast but sometimes it still does pop up. What Im talking about is perhaps early morning or dusk, contrast between bush or land and sky may leave the ground looking extremely dark.
If your interested in slow motion, in iMovie, the gopro 2 has seamless slo mo, while the go pro 1 is a little choppy but still acceptable.
Awesome little camera for a relatively cheap price - my recommendation is to go and get a go pro 2 now, if your interested in documenting your activities you will definately not regret the purchase