I haven't found any problems with them. Talking to the guy at the plant, they showed me little sample bottles of the solution and shot they use inside there. They've got a wall in their office with some that came off big trucks with a card stating how many miles were on them. Someone in Canada had a set with 1 million miles. They were in the process of trading him for some new ones just so they could have them to display.

They also work as a pretty good dust shield. I've had them for about 1 1/2 years and so far I'm happy with them. I've got street tires, but my wife has some BFG AT's. Neither of us has had our tires balanced since we put them on.