Having owned 3 pairs of ML-2s, I can say with confidence that they are NOT the best sounding Mark Levinson amps. They do have somewhat "dark" sound that plagued some of the early ML amps, and they can be hard (and $$$) to repair if and when they fail, and they DID fail.
27.5, 23.5, 20.5(6), and later 3XX series amps are all much better sounding
27.5, 23.5, 20.5(6), and later 3XX series amps are all much better sounding