My bike has ultralight tubes, and in the month that I've owned my bike, I've already killed three of the tubes:

Tube 1: I separated the valve stem from the tube when taking the floor pump's chuck off. (Front tire)

Tube 2: Blow-out from h*ll described in other posts. (Front tire)

Tube 3: Valve stem separated from tube -- I dunno how. I'd brought my bike to show some of my relatives. When I unloaded it from my truck, the rear tire was flat. Wouldn't hold air -- heck, it wouldn't receive air. Wiggled valve stem -- it's a little loose. I'll change it tonight. (Rear tire, for a change)

Hmm, maybe the helium makes the tubes age faster....

Seriously, though, anyone else have experiences with the ultralight tubes? I'd rather hear from others before writing them off as not-such-a-good-piece-of-equipment.

-- Melissa