+1 for Facewest – excellent shop.
As above not much good with shovel and probes to dig someone out with but they could potentially save your life if you wear one. If with a group and I know I’m going off piste all day I’ll take all the gear. If its snowed a bit but im not planning on going off piste (much) and not with a group then I just wear my transceiver alone.
I imagine most/all piste security guides will use a transceiver to find people as a first resort, if your buried without one try to get knocked unconsciousness and wee yourself!
Not sure if this still applies but several years ago a piste security guy got buried and died. He had a transceiver and so did the people looking for him but they didn’t find him in time – turns out he had his phone on and it confused the signal.
http://pistehors.com/news/forums/ Good website although french based.