First of all, we're talking about at shows and we know what that can mean.
Second, at the shows, the M&Ms sound to me like every other Class D amp save the Rowlands: washed out, white-ish, dry, wispy, two dimensional and lacking midrange. In short, amusical. The Rowland is musical, has a midrange and musical overtones that the other Class D amps hunger for. Maybe it would be a different result in my system. It wouldn't be the first time. Maybe they would sound better with analog. Who knows? That's why this show thing is a crapshoot.
Third, where has the midrange gone in audio period???
YMMV....