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I saw some people talking about Zvex before. I picked up the Mastotron fuzz pedal a while ago since it was cheap and I'm a big fan of Zvex, and at first I loved it. Then I hated it for a little while. But I'm back to living it again. The reason I hated it was because I couldn't get that "Billy Corgan tone" out of it, but really this pedal isn't for that. It's really good if you want great thin, piercing crunch but you can also dial some pretty smooth, bottom-end-y sounds into it too. I like using it with a dirty channel and an octaver to make it SUPER heavy.
That Billy Corgan tone comes from an IC Big Muff. They're pretty damn rare, but there are some great copies out there. It sounds a bit different from a standard big muff because the ic big muff uses a special chip. Here, I'll pull up a video.