I just got this harness a couple of weeks ago and it's sweet!!! I really like the chest cam point of view, the angle is sick while skiing since your core doesn't bob up and down as easily as your head with a helmet mount, so the shot is generally more stable. It is also really nice since you can see the screen on the gopro and know when it is recording, what mode it is in and all that good stuff. This harness is burly, made with thick elastic straps and burly plastic, I dont see this breaking anytime soon.
The only issue I have had so far is on particularly deep powder days sometimes the camera gets caked with copious amounts of snow from epic face shots. On those days it is probably better to go with a helmet cam. Then again I wasn't complaining on account of the epic face shots.
In conclusion, if you dont like looking like a teletubby with your helmet mount and still like to get sweet footage, try this out!