No they do not suck, they ride very smooth! It All depends on how much air you run in them. Ive ran 10lbs in them when mud riding in some nasty stuff, they perform awesome. But you will get some vibes when on hard pack surfaces. When im just ridin around on the creek or something i usually run 1.5-2lbs of air, they ride extremely smooth. And they hook up way better than any tire my friends have. they are not that expensive either, i will be buyin another set when these wear out. Ive gotten over 1000 miles on them now, and they wear like iron. Ive even done a few burnouts with them on the blacktop, up to 40mph.. just for the heck of it..
They do awesome in nasty mud also.. you wont make it through quicker than guys with 29.5 outlaws, but they will suprise you if you can drive.
But for what i payed for them,, i will be buying some more.