I test rode one when I was looking for my new bike and the ZX-9 was a turd compared to my other bikes. It just seemed like a GSXR750 would walk all over it. Don't get me wrong, I am sure it had good points but I couldn't find them. Sorry for the distinction of wheelies, I meant sit down with a small tug on handlebars wheelies. Oh well, back to the point riding the ZX-9 and a R1 made me get the 40th A. Busa.
You should check out the video that was on the HQ a couple of weeks ago, it was a clip from the latest ghostriders video. A 499HP busa pulling wheelies at 180+, someone teach me to do that and I will be happy.