After running S12's for years I finally broke down and stepped outside the box with a set of Bridgestones. The M404 is a rather nice tire, I have put roughly 10 hours of ride time on a groomed motocross track, 1 hour on a 100% blue grooved track, and a few practice sessions at my private track that is hard packed as well and these tires have yet to lose their edge. They hook rather well in mud, and dont spin a lot on hard packed. Im a 25+ A rider on a yz450f, and I approve of this tire!!!