I don't know if it has been mentioned in this thread before, but the MG3 is a so-called "chip amp." This may not be accurate, but I read at the AudioCircle forum that It's built around a Texas Instruments TPA3100D2.
Everything I've read makes it clear that Jan Plummer has taken this diamond in the rough and worked wonders with it.
Knowing that this TBI giant-killer of an amp is just a "chimp amp" at heart, makes me like it all the more. It's the antithesis of a Burson Soloist's design, for example, which uses discrete components - but the MG3 sounds so much better.