We tried a 2011 9m C4 up at Exmouth. It felt similar to the 2010 model, slightly lighter, smoother and more responsive. I would describe it as the kind of kite where you can pick it up and feel totally dialed straight away. The improvements became even more noticeable when we went back to the 2010 model. Awesome for waves or flat, unhooked moves or cranking predictable, powerful boosts and kiteloops. Definitely worth trying, I think they start arriving in Oz in the next few weeks!