I did a review on the Crazy Fly Slash a while ago, after purchasing both the 9 and 7m. Link to my earlier review Here:
www.seabreeze.com.au/forums/Kitesurfing/Review/CrazyFly-Slash-2011/Well, I've spent the whole season on my Crazy Fly's and I'm still pumped with their performance and build quality. The 9m is definitely my favorite ride for freestyle or strapless surf but I can't go past the 7 for insane loops!!!!!
I would like a bit more low end in the 9 (mainly cause I don't want to ride anything bigger), but when it counts (when there's wind) these kites rock, and I still haven't found the top end of my 7m!@
I wouldn't hesitate to recommend these kites! Ride one if you get the chance and make up your own mind.