Been twice, First of season (no snow) and Easter (snow)
Once with ample snow, so plenty of slopes to cover. Make sure you take full face cover if going up to the glacier, I remember it was rather exposed and cold up there. Night slope is a little attraction but not worth it really. If there's enough snow and not too windy, the long black Sarenne I believe was a good run.
Second time didn't have a lot of the snow, so quite a few of the lower slopes weren't open, and the competition and night slopes were out of use too (as they are directed into the sun all day).
Still a nice town, good selection of hotels and worth going to.