I had an F1 clutch that didn't release, https://www.miataturbo.net/suspension-brakes-drivetrain-49/f1-clutch-doesnt-disengage-48832/. Switched for a used ACT, no problems.

Just a little slightly off topic pointer I've come across from researching:

For performance applications, go with organic or ceramic. Apperantly, according to basically anything I've read, kevlar clutches tend to last a long time, but aren't grippy at all. (Stage 2 is a kevlar - that would explain it).

The way I see it, kevlar for stock replacements
Ceramic/organic for performance.

Of course, there are exceptions to the rule, but this is what the general consensus among teh intrawebz seems to be.