I just finished building a clone from generalguitargadgets and this thing sounds amazing. I wonder why (besides SRV) this one didn't catch on as a clone? I am thinking of making a dual BB in a larger enclosure for two levels of boost/gain.
I spent some time A/B'ing with my FD-2 MOSFET to emulate the BB pedal and got real close - but the BB just has that extra sparkle and slightly compressed sound to it that makes it sound perfect to my ears.