UPDATE....Well, after months/years? of comparisons and listening over and over, I finally picked up a good Mc2100 (although I will keep the QSC PLX 1202 as a back up).
I feel the Rocktron V300 and the MosValve get very close too, but not dead on. Anyway, I built a cab for the Mc2100 and am loving the tone.
Should have gotton a McIntosh a couple of yrs ago. I was trying not to deal with the McIntosh weight, but with it in it's own cab with handles on each side, I can get someone in my band to help!