I went with the chest mount for a couple of reasons. (1) It is easier to setup and trade off with partners in the BC or in-bounds. (2) I figured with the camera mounted on the chest it would be easier to see the skis and the horizon in the same shot. I think it makes for a better vid.
I'm seeing about 5 gopros or more to 1 contour at Mt. Baker....even saw a patroller ripping down with a gopro mounted to the side of his helmet. I've also spotted it in a couple in ski porn trailers. This one from the Rocky Mountain Sherpas is by far and away the coolest i've found. There's a gropro at about the 4 min. mark. Prepare to have your mind blown. :) (also, the gopro does time lapse which is used very nicely in the all.i.can trailer below)
IMO, the gopro is superior to most the stuff out there right now. Apparently, they are working on making it so you can mount up two of their full HD cameras and link them for 3D footage. Crazy.
I still need to do some more experimenting with it. I changed up the chest mount last night so it will be higher and hopefully avoid the "too much arms problem" from the posted vid. I also plan on putting on the permanent helmet mount on the front to see how that turns out. Last weekend I also mounted the gopro to my ski. I worked well, but I accidentally deleted the vid off of my computer. The go pro has so many mounting options. Hopefully I'll have it all dialed in before my cat trip.
I'll step off my gopro soapbox before i fall off.