I blew out a sidewall in the Summer, but bought another one to replace it. Other than that, I've found them to be pretty good. They grip well on dirt, concrete and wood. Good all around tire and they roll fast too. As well, they have yet to show any serious signs of wear so far. I'd recommend them.
I'm not completely sure, ha ha. I was riding a park in BC, doing a bunch of tireslides and it actually popped as I was just coasting around. 'Twas weird.