I am considering buying a slipper clutch and came across the Italian made STM, which claims its slipper clutch is being used by Chad Reed, David Vuillemin, Michel Pichon, Bartolini, Chiodi, and Stefan Merriman, so quite a reputation. I wondered if anyone could help me make decision. What I noticed is that the STM has no external regulation, one has to buy a different coil for different adjustments. But STM seems very keen on the Yamaha 450, any suggestion? Who?