I went through 3 of these in a few weeks. They were the only ones that my LBS had on the shelf. I had a pinch flats on the original tube that came with the bike. I got the puncture resistant tube and was surprised at how heavy they were and how large they were uninflated. So large I could not fit it into my trunk bag.

I went home with the tube and mounted it, tried to fill it but it wouldn't hold air. It was blown out around the vale. I went back to the LBS with it and they said they had never had any issues with them. They managed to find 2 more "in the back" so they traded me one for the bad tube and I bought the other one. The second one held air - for a few hundred miles then blew out in exactly the same spot - around the valve. I had to walk 1/2 a mile home, swapped out the tube for the last one and it held for 17 miles, stranding me 3 miles from home. I took them both back and they finally said that they have had a lot of returns with failures around the valve stem. No DUH!

I switched back to a normal tube, so far it's been god for a few hundred miles so far.