I had the Iron Ether Oxide for awhile and I personally didn't like it... It was supposed to range pretty much from Brassmaster to gated Mammoth.... The Mammoth-y sounds sounded too "synthy" (I guess that's the point?) and the Brassmaster side sounded very NIN-ish, copped the tone real well but that's not what I was looking for. Grey Stache is a sweet Fuzzrocious muff clone, they trade in the classifieds alot as people like to rotate their muffs... Alot of options, a mid knob, and the 3 diode settings are nice different tones. Rat Tails are hard to find in classifieds lately, seem to be highly sought after but I'm guessing it's for a reason.