Well I just got my first taste of of a new 450 YZ! All I can say is WOW!! My son showed up with his barely broken in YZ. We changed the jetting and set the suspension settings and took it to a local track for testing. I didn't plan on riding the thing, but after seeing him fly around on the thing I had to give it a try. My last trip on an MX course was my 99 400 F. Within two laps, I felt As though I could compete in my class on this thing. How lucky you all are who have this model. I am glad I left my Honda at home.