Did a season there last year. Pretty rubbish snow whole year through, very small amount of terrain, usually a pretty decent park at Cardrona and Snow Park is obviously sick, didn't make it up to Treble cone but apparently the terrain is better there. Some seriously cold days, only had like one or two t-shirt days throughout the whole season though.
Usually there are shit loads of pro's there, although it might have just been for the Revolver world premiere (claim). But yeh the Wells bro's, Dumont, Wallisch, AJ, were all there and up at Cardrona/Snow Park a lot.
Also Wanaka itself is fucking amazing, easily the most beautiful place in the world I've ever been to. As well as the nicest people I've ever met, and just such an awesome chilled out atmosphere around town.
Check out Red Star for the best fucking burgers on the planet.