I have a friend who asked me, " if you had your choice based on overall satisfaction and performance which would you get a 636 or a zx10?" I thought about it and having had an 1100 GSXR and a CBR1000 both 90s'era, I told him my new 636 was still my choice. He wanted to know if there is significant low end difference. I have not ridden a new ZX10. Does anyone have any input? I understand he is a fairly new rider and the first bike should probably be the 636, but that aside does the ZX10 really wow you over the 636?