I’ve been running the 19g RideNow tubes. I’d say 1 in 6 have a slow-leak valve defect, and the risk of pinching when installing/swapping is like 1 in 4 for me—and I think with 15 years of racing and tube-swapping experience, I’ve gotten better over time but they really require far more care and patience during install compared to butyl or latex.
I think they’re price competitive with tubeless (as in they don’t eat away the price savings of buying the clincher version over tubeless of the same tire), lighter than tubeless, same RR as latex, same air retention as butyl. So I just buy a 4 or 6 pack and assume 1 is going in the trash.