Have had for a month or two and no problems at all . You can definitely feel the difference.

Super light tube and durable

These are noticeably lighter than normal tubes, and they do seem durable as well. I have cased on a curb a few times hard enough that I would likely get a flat with a normal tube, but didn't with these. One thing to note is that the valve stems are bright orange like the tubes themselves. I think it looks kind of cool, but if your bike has a really specific color scheme, these might clash with that if that's the kind of thing you care about.

I wasn’t sure what to think before I bought these… I heard all the hype and didn’t really believe it, and then I bought them. You really can feel a difference when you ride. Things feel more responsive and you can feel more in the wheels as you ride… it’s hard to explain. Yes they’re expensive, but I think they are worth it.

Well, what can I say, the hype is real, these truly are exceptionally light weight and have a really nice feel about them. if this doesn't sound too odd, kind of light an inflated lilo lol. but no, on a serious matter the entire product is beautiful and the valve is very solid and trust worthy. regarding its longevity, time will tell, for now I am very pleased with he product and will certainly be changing all my bikes to these one by one.