Well I will start by telling you about me then everyone can get an idea for themselves. I am coming off Kawasakis 06, 07, 08, and 09 Im 220#s 6'2" VetB,250B. I got to ride for the first time at an indoor track so there was no high speed sections so I can not comment on that. But I can say the YZ feels much lighter than my Kawi and it turns much better also, I never could really groove on my 09 like I could on my 06, 07, 08. When entering a turn it tracks very true and does nothing weird inside or outside lines, in fact you can switch lines with no effort. It falls into a rut very well and stays put as long as you do not wack the throttle open. The motor is very very strong on the bottom so you do have respect it! very little clutch usage. The midrange also is very strong and I really can not say much about the top end because the track was small. The bike is really comfortable and very easy to ride. I hope I feel the same as I do now when I get to ride outdoors! So far I am extremely pleased with my choice!