Worth the extra couple bucks over generic tubes. They just have a quality feel to them. The presta valves are not fragile. They maintain air pressure very well too. This was my first experience with this brand, but I think they may have bumped Continental down a peg in my tube hierarchy. Will definitely buy these again.
Reviewing a butyl tube, is kind of like rating toilet paper. When it is better than average, it is noticeable! When I opened these tubes, I definitely noticed some attention to detail that other tubes do not include. So far, they are holding up well....
These tubes are so worth it. They are very high quality and you can see it when installing. I have never had the mysterious seam split or valve breakage like some other brands. There is just one small item after using dozens of these tubes. No, i am not fully on the tubeless bandwagon! About every fourth tube has a loose valve core. Not fully loose but enough to let the air out in about 1-2 days. A quarter turn of a valve core wrench fixes the problem, but it is annoying. I am learned to check the valve cores with each tube change.
I went from a regular valve to the Presta valve and overall the tubes have performed beautifully. They were easy to install and they have held air better than my last tubes.