it's quite easy to get a bad sound out of the Major, especially if it had the 'Texture' control added. If texture is to the left and so is the voice control then things get muddy, roll one the other way and things clear up. I've gigged mine hard every weekend for the last 2 years, it's let me down a few times (valves and mainly) but other than that it's been great. My issue with it now is that the front end drive is quite hard, but i do think that is because i tried a friends Cornell Plexi a few months ago!
I have to disagree with twinfans clarity statement, my KSM is one of the few amps that i've tried which when you add overdrive and distortion and play a full chord (with 3rds and 7ths) you can still pick out all the notes. But from my understanding there was been some bad sounding Matamps :?