everyones experience is gonna be different, but just last week my buddy went thru 2 tubes that we purchased from the same store, same brand, same installer...yes they were the cheap stuff, rips at the valve stem area...no its not a pinch flat since the bike was not ridden for a couple of days after the tubes were installed, and the leaks were one day apart...when it was time for us to ride the bike was out of order...so frustrating...got 60mm presta bontragers and have not had any probs so far, rode at least 40+ miles on the tubes already

:fingerscrossed:

we are just glad the tubes didnt decide to bust while we are in the middle of our work out