I really like them, although I haven't got to ski a full park yet with them. On rails, they're nice and light, while still stable. I've only got to use them on smaller jumps, so I'm not sure how they'll hold up on the big stuff.
The reason for the rocker is mainly for buttering, which they are awesome at. Also, there's supposed to be less chance of catching when spinning off jumps, but I'm not really sure how much you'll notice that.
As for just normal skiing, they are suprisignly good on groomers, and should be awesome in pow, when we get some. Now I'm talking about Ontario pow here, so nothing too deep.
Overall, they're a really fun, playful ski. I'll probably write a full review on them once I ski some more on them, so in a week or two.