how much video can you shoot in one session??
Two AAA batteries give you about 3-4 hours of use (depending on water temp). The size of your SD card limits your footage time. I have a 2 gig card and get 1:04 hrs on it. I've heard that it can fit bigger cards, but don't have one yet to verify.
It gets about a solid tank of gas for Oceanside (actual riding time, not to and from the harbor).
I like it a lot. I don't have to mess with it. I take my helmet off to see if it is running, then put it back on and forget about it. I can simply look down after a big landing and see if the camera is still there. I don't have to reach and feel for it like most helmet cams.
Definitely worth getting if you are looking for a light weight, no hassle video and still camera. Plus, the company is located in San Diego. Very nice for warranty work and repairs. Their Customer Service department is top notch. A bunch of local surfers who know how the camera is supposed to work!!!