I've never been on a new 450, so I can only comment on what I know. The only gripes I have is im always searching for more gears and hot start is a bitch! I had a 2000 XR400 a few yrs back that could only just do 3rd gear wheelstands, this thing does 5th gear wheelstands all day every day. Power and throttle response is amazing, almost too lively! I read somewhere that the yz426's have the most aggressive power curve of all the big MXers. Is that true?