foxyloxy said: What do you like about them?
Fuzzy. Not as shrill and noisy as your standard Big Muff. Warm. Really nice classic fuzz tone, in my opinion.
They don't sound crappy like regular Big Muffs, but still have that old-school, analog, Electro-Harmonix vibe. I'd compare the Big Muff and the Double Muff like this: The Big Muff is a sour apple, the Double Muff is an apple pie. The Nano Muff (Muff Overdrive), is just half of a Double Muff. Really all you need in my opinion, but the "two-fuzz" option is nice.
All in all, they're just really sweet sounding pedals that can go from a mild overdrive to a rip-roaring fuzz without the cold, shrill, mid-scooped sound of your run-of-the-mill Big Muff. These, in my humble opinion, are what the Big Muff should sound like.
Not to offend Earth (as I do admire his Big Muff collection) or any other Big Muff fan, they're just not my cup of tea. I'll always be a fan of EHX though, despite disliking the Big Muff. Most of their pedals are brilliant (Frequency Analyzer, Double Muff, POG, Holy Grail, Small Stone, Small Clone, Electric Mistress, etc).