Good skiing up to end of March. Excellent variety of pistes for families.Not a lot to do in the resort after skiing.
It is easy as can be from Nice, and the resort offers excellent skiing for all levels.
However, activities after skiing, even for a family with young children and no need of nightlife, are extremely limited. They include shopping ( ski wear only), eating out ( quite pricey), and not much else. If you have a car and are getting cabin fever in the afternoon, you can drive to the swimming pool in Isola village, which is excellent for children, and, if you are a dedicated swimmer who does not mind being confined to one lane, provides enough to do for adults too for a decent price( look up Aquavallee for more info).
I would definitely go back given the good value offered by weekly ski passes, especially when bought during Tuesday night flash sales. It is also cheaper to fly to Nice during ski season than to Genoble , Chambery or Lyon.
Warning; despite the altitude, it will get hotter than more northerly resorts sooner, as we found was the case when we went in April. Having said that, slopes are maintained assiduously and skiing in the morning is possible even in the late season.