I've got one of their HQ-1 bespoke jobbies. It's a very gucci camera, but I wouldnt want to take it out doing green stuff, cause it goes though batteries at a rate of knots, and maybe just me, but lugging dozens of batteries on top of my normal kit doesnt strike me as the best way to get the most out of life.
If however, you want to do sporty-style stuff with your camera, then that sort of thing is brill, cause you can get chargeable power supplies for them, that are bloody heavy, but of you're snowboarding/skiing/cycling etc, then that point is moot.
Remember, with the more gucci stuff, you'll need a recorder as well as the camera, cause really ony the lower-end stuff has built-in recording, which is normally to SD card.
PM me if you have any other questions about running that sort of equipment.
I've recently bought a helmet camera from Action Cameras and although I haven't been able to really make use of it yet, I would just like to say that I was very impressed with the quality of the service I received from them.