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.
Replaced a set of tubes when I put on new tires and am noticing that at pre-ride check, I have to top off with less air than the prior tubes. The valve feels very sturdy, too. So far, so good!
I purchased these Schwalbe tubes while on sale as they were less expensive than the brand of tubes I usually use for my road bikes. So far so good and don't have any issues to report.