My 8.0 cheetah is still going with learning how to plane on it, with all the crashes, 3 years now. My 9.5 cheetah is in better shape but has less miles on it, and fewer crashes.
My severne blade is holding up for 2 something years. It's been taking some hits by a beginner and held up to what are to me crazy high wind days and associated crashes.
I've torn a severne hgo 9.0 to tatters after counting 100 sessions or so in two years with it and learning to race foil, with all the crashes, and bought a second hand one and have replaced a batten in it from my first sail. I'm probably somewhere around 125-150 sessions with that sail and the performance in that case seems to be worth it, given how much abuse and bad sailing I've given it

I think my other most used sail is the goya mark 6.6 that I totally crashed through, blowing out a panel, but it's repaired with tape and usable as a big sail for a beginner who is close to planing.