Absolutely love my 250.The Zilla I don,t have much ride time on as I,m fixing a clutch basket/plates issue but I can say it feels very clumbsy compared to the 250 on the track and even trail riding in general.Now if your out in the open or service/logging trails it never stops pulling.Also on the sand MX tracks its much nicer as the tourque of the 500 doesn,t bog or require constant shift to stay on the pipe.Through the whoops so far I,ll take the 250 hands down.In the short amount of seat time on the 500 I,m with Chuckie,give me the 250 all day as of right now.Once I get the clutch fixed and some more ride time my opinion may change.Likely won,t be till next season now though.Snomo season coming up so the quads will be collecting some dust.