Every manufacturer motorcycle have their own characteristics. I have the 09 R1 and I personally love that bike. The cross plane engine have a lot of torque and the way the engine produces power, the bike always feels slow and composed so you have less survival reactions to deal with. I want to try the 15 and up but I have too many toys that I am not willing to part with. There is no way to know if you would like it or not because no one but you knows what kind of characteristics will suit you. If you go to the R1 forum, those guys speak of the 15 like it's the bike of all bikes. Before the 15, they spoke about the previous generation as the bike of all bikes. You go to the BMW forum and the s1000rr is the bike to have, you come to the ZX6R forum and the ZX is the bike to have. I personally love all bikes and love getting to know the characteristics of that bikes. The 09 ZX6R is new to me and I've only taken it on one track day so far. I think I personally will learn to enjoy it's characteristics. Seat time and getting used to a bike is the only way to truly know if a bike is a good suit for you. And I'm not taking about crappy brakes, or soft suspension. All of those things can be adjusted. All of those things can make the bike feel like crap if not right. I'm talking about the actual characteristics of the bike.