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.
Paired these tubes with 700x23mm Conti 4000s tires, the combination is mounted on HED Ardennes FR clinchers and I'm a happy man. Great ride, good road feel, finishing the rides feeling fresh and so far No flats! I would recommend this set up to a friend.
Been using this tube for years mostly with Vittoria Rubino Pro's with a fairly high PSI (110-120). I get pretty good milage out of these on my road bike, commuter bike, and track bike.