I recently patched a tube (rear) and found out later that I still had a slow leak. If I wasn't such a cheap bastage, and bought a new tube in the first place, I wouldn't be facing another tire change! Anyway, I went down to the shop and bought a Moose Heavy Duty Tube. It cost over twice as much as a standard tube ($18.95 US), but I am getting tired changing these damn tires so I figured that it would be worth it. My question is, are these things worth the extra money? My last flat was a severe pinch (there were some serious rocks at the Elsinore GP!) that probably would have flatted any tube. Anyone have experience with these heavy duty tubes? Do they actually prevent flats?