I really like my hd hero. It shoots in great quality. I think next year's hd hero is suppose to have 1080 resolution with 60fps, while the current one is 720 res at 60fps or 1080 res at 30fps.
I haven't used any other helmet cams to compare it to, but the footage quality is so amazing for it's size that my computer can't handle raw footage at full speed.
If you want to see some footage from mine,it's on youtube right here,
but this version was compressed down to work on my computer, and then raped again by youtube. The raw footage is much better resolution and quality.