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.
Have used these Continental Race light tubes in 700x25 (Michelin) racing and training tires for several years. No problems. Stems work well with screw-on, shop and bike-mounted, pumps (Lezyne.) Sometimes I deflate slightly after ride, sometimes I just leave them at 110 psi. Doesn't seem to make any difference. (Although I still feel, from the old sew-days, that stretched rubber should be allowed to rest after a ride.) I would give it 5-stars except can't see calling any plain-ol' bike tube awesome and a steal. ,-
I got these this year since I've started racing as well as doing more high climb centuries (9000 - 11,000 ft) to save weight. However, I'm switching back to Tour 700s because I've been having so many pinch flats during training rides. The rural roads around here have plenty of potholes, rocks, debris, etc. and I got stranded 50 miles from home yesterday with two pinch flats (one on my rear tire and then another on my spare).