what are some up and down in this machine and how do they do racing wise

 

Too soon to really tell.

 

what about the regular one

 

The YFZ has won more races than any 450 or any other bike for that matter. Bill Ballance broke the old GNCC record of 7 straight wins with 9 on a YFZ and next year will probably finish his carrier and tenth straight with the R! All the 450s are very similar in size and power output and some come with some pretty nice features from the factory but IMO there is only one true 450 and that is the one that started it all the YFZ!

 

Amen, Brother!!