I just posted an interview I did this month with J Mascis of Dinosaur Jr about his gear, vintage Big Muff collection, and other things. He mentions one of his favorite vintage Big Muff clones was the Ronsound Hairpie, from non other than our own EH Man, Ron Neeley.

It’s on my website here.
http://www.kitrae.net/music/J_Mascis_Big_Muff.html

J talks a lot about his early EHX pedals. Here is one quote:
KR: Is there a reason you went with mostly Electro-Harmonix pedals in the early days?

JM: Well, just trying out stuff they seemed to be the only one that had any kind of extreme sounds. Everything else I tried was just too subtle and didn’t really do enough for my tastes, so that was the main thing.

KR: Electro-Harmonix was definitely on top in a lot of areas that other makers chose to pull back on.

JM: Yeah, I wasn’t into subtlety very much (laughs). I want you to know something is happening when you turn the pedal on, rather than just a subtle tone shift.