Great views, big cross border ski area, good new facilities and restaurants
Usual French purpose built problem - little character or nightlife.
Although it seems like a traditional resort, most of La Rosiere has been built especially for skiing in the past few decades and it closes down completely in Spring and Autumn. On the plus side this means most facilities are fairly convenient and ski area itself well designed, on the down side it doesn't have much more character than a shopping Mall.
We stayed in the newer development which is about a kilometre from the original village, which we hardly visited. The new part had a handful of very nice bars and restaurant and what I think is the resort's new recreational area off the slopes with a little bowling alley, games room and ice rink. So whilst night life wasn't very lively - like most French purpose built resorts, it was good enough for the three nights we stayed.
The ski area is mostly made up of fast long blues and reds served by some nice fast chairlifts. The big point of interest is the cross border connection to Italy which I heard is quite often closed, usually because it gets very windy and i think there can be avalanche danger. It is a lengthy plateau with long flats and drag lift rides, the wind means its great for ski kiting and we saw some guys whizing around. The Italian side has some interesting trails carved down through the woodlands and it's great to pop over, eat so,me pasta and pizza (Not that there's any problem getting those in Ia Rosiere, but that's hardly the point).