I use mine for biking multiple times a week and the battery last over 2h40m. I have it in the front and the gopro hero 2 mounted at the back of the bike:
Contour Roam - Front of bike:
Gopro - Rear of bike:
Ignore the fact these two images are not of the same event, but you get the idea.
Actual video is extremely sharp for both but compression through youtube kills the quality.
People get all bent out of shape that the contour has a built in battery pack. I did initially, but the one that is in the camera seems high quality and I’ve been using it every week for about two years with no degregation (sp?) of the battery. I actually use it more than my gopro, esp skiiing since the form factor is way better.
If you need extra battery life, use a battery pack with usb to get the extra recod time. That’s what I do, but the battery compartment flip cover will have to be left open. No big deal for what I do (biking and skiing), but there is a possibility I may rip off the cover by accident.