Yes, Kris has it correct. I read his posts on the other thread.
These clutches are nothing new, we've all been thru all this on ATV's. The problem with the CVTrash is the fact that it overrevvs really bad. They can be helped by installing a really low initial rate spring, thus allowing the clutch have more belt clamp when the belt is low in the primary. This is only a patch. This only lowers the stall speed, and to raise it, requires a stronger spring, which makes it overrev.
Now...on the Mav, it overrevs as stock, or at least mine does, and according to some others on here, theirs does too. Why would anyone install a clutch that is known for overrev, on a machine that already has overrev issues??
What the truth is, is most people don't know what overev is, and bolt on a clutch that allows their motor to rev up really quick, and they think they have more power, or perceived more power. When in fact, what's happening is the belt is slipping when the belt is low in the primary, allowing the motor to rev, then reign it back in, as the belt moves up in the primary.
A QSC has adjustable weights to deal with this very problem. So does the STM. CVTrash does not.
Ya'll need to be aware that a cast clutch will explode at high revs. (ask me how I know) They aren't usually to be revved past 8500rpms. The QSC is a fine clutch, except it has a lot of parts that are cast. The STM is all billet, and I have personally tested them to over 10,000rpms, without fail.
The STM Rage 3 is their introductory model, is priced around $800. So I don't see why anyone would argue price, or anything else.
I have posted the rpm range, and the power was still climbing when the rev limiter kicked in at 8000. I do have the full Muzzy installed, maybe that is raising the power range, idk.