I've worked with a few people who have used them and I think they worked mostly with the clamp mount :
http://gopro.com/camera-mounts/jaws-flex-clamp. (For shooting this kind of thing
http://www.youtube.com/watch?v=3bijQXgNM0g) Also someone I know used the adhesive mount and managed to get it off without any problems after a couple of weeks.
Just my 2c but I got a GoPro3 for work and had loads of problems with it. It kept cutting out and not responding which (according to the internet) was a common problem with some batches. I sent it back and got it replaced (from the same store) and had similar problems so in the end ditched it. I think there were some batches of the 3 Black that had problems but having said that they worked fine for most people so I was probably just unlucky and I didn't have any issues sending it back and getting a refund.