No.
I've never, ever come across these in use on-piste.
If you are a group going into deep back-country, then you might want to consider them.
But a few things to consider are:
You, and everyone in your group, need to learn the correct method of using them.
It's a mountain skill that rerquires training and practice.
( They don't point directly to the victim, for example: they take you in a loop, following the flux-lines from the transmitter. )
You all need to practice using them; ( many resorts have practice areas, with buried transponders for you to practice with );
You need to have probes and shuvvels, know how to use them too, and enough people to use them effectively.
The first few minutes are critical.
