Those MXR4's hook up pretty good...for about 15 rides. A buddy w/a YFZ450 bought some of those last season (brand new). He liked them a lot. No joke, those fuckers were wore down after 10 races. So he flipped them around and wore down the other side, and he got about 3 more races of out them. I couldn't believe ITP would charge someone like much fuckin' money and not have them last a full season. Like I said, they hook up, but if I'm not getting those damn things for free, you won't see them on my bike.
EDIT: By the end of the season, he heard me talking about my Klaws so damn much that he went out and bought a set of his own. He says he hasn't regretted the switch at all.