This review is from: Mountmap Three Valleys (Les Trois Vallees) Winter 2006 (3D Navigator) (Map)
I bought one of these before my first trip to the 3-valleys. Really useful for all the reasons you would expect. Easier to find where you are, where you want to go etc. Much tougher than a paper map, but you would expect at least that given the extra cost.
If you've been to the resort before, then I don't really think this will be that useful, but for first-timers it made navigation much less of a drag.