Booyah! Thanks Thom (vegas)!!!
Evan Weiss from Damiera and Thomas Mitchener from HAUNTS are both using the Mail Order Muff and have said that it stacks up to the Sovtek Big Muff Pi (green). Thomas Mitchener is a TB user. You can hit him on here or on his band's MySpace.
JD @ General Guitar Gadgets has created some AMAZING replicas of the original muff circuitry and stepped up the game with his GGG-tuned version.
So onto comparisons to the Supercollider and Bass Big Muff...
Since the Bass Big Muff is based partly on the Sovtek Big Muff, the sound should be close to the Mail Order Muff, but obviously you'll have more options with the EHX's blend function. When compared to the Green Stache, that's a different story. The Green Stache is more midsy and much more gainy. Jeff (Bassenstein) uses it for a wall of sound fuzz. If you want more bass response, go for the Bass Big Muff or Mail Order Muff. If you want to fuzz your brains out, the Green Stache or Blue Beard or other high gain fuzz would win over the Bass Big Muff or Mail Order Muff...but if you want a blend, the Bass Big Muff is your best bet. Grygrx has a great review of the BBM over at
http://bassfuzz.com. Definitely check it out!
The Supercollider, as many attest to on this forum, has a lot of tweakability! 5 knobs, mids control, smoothness or warm gain on tap. You get more options on hand with the SC.