i run klaw xcr on my 450. i race cross country races and the have been holding up great. the set i just retired has about 300 to 400 miles on them. thier is still plenty of tread left on them all so, just not enough for me. another thing about the tires is the price. cheaper than razars and raged holeshots ( that like to leak around bead) my opinion best tire for the money.
I run razor2's. I think they are the best. I don't have any problem sliding around corners with them. On the hills where holeshots get stuck I just go on by. The razor2's are great for mud. And they last, I have 6+ GNCC races on them and they don't show much wear.