I bought these tubes to use in my first triathlon. They arrived the day before the race. I installed them, but one of the tubes would not hold air. I discovered a tiny hole in that brand new tube. I left the other tube installed, but the next morning I noticed the tire was flat. After removal, I found a 1 inch long split in the rubber. Fortunately, there was enough time to install standard weight Kenda tubes prior to my race. I e-mailed Western Bike Works (WBW) the next day to notify them of the faulty tubes. They gave me a prompt refund of the cost of the tubes, so kudos to WBW. Excellent customer service!
A quality light-weight tube. Does what it should. Not stupid expensive.
The only potential negatives to me are the price and the box size. The Vittoria tube is very similar, cheaper, and comes in a small enough package to fit in your jersey pocket.