I've been wanting to compare these two GREAT kites for some time now. While I've been riding the GK 11 for months now, it hasn't been windy enough for me to use my BEST Waroo 9.
Yesterday, it was FINALLY windy enough to try out my new WAROO - low 20's with gusts into the high 20's. Note the gusty 8-10 Mph (25-30%) range.
Unquestionably, both of these kites handle gusts supremely better, provide MUCH better range, and provide much more power at the top of the wind window than C-kites.
Here's my conclusion thus far: (update 7/24/06) I like both kites BUT prefer flying the WAROO when its windy :