Fwiw, the M1 was shown at CES in 1993 where it received the best sound at CES award. It was built while he worked for Madison Fielding but they would not put it into production, so he waited until he started his own company to go public with it. The ML2 came out in the late '90s - first reviewed in 1999.
I agree the solid-state MOSFET amps (110 Watts +) sound different from the 633C SET amps (18 W). I own both the M1.2 and the ML2.2. But to my ears on the JBLs they sound more similar than different; I prefer the ML2 overall but the additional power of the M1.2 has that advantage.