I remember "Sheet One" VERY fondly. This album was my introduction to proper acid mid-way through the 90's. Though it's seldom (if ever) mentioned in this short-sited web forum, Hawtin is one of the most important progenitors of acid. While Chicago producers may get credit for recording random 16-step patterns and lazily turning some knobs, Hawtin was the first (that I'm aware of) producer to really rinse the 303, including championing the Devilfish modification.
Despite all this, I tuned him out out back around 1997 when his world tour started. I found his Concept series to be a bit droll, and I consider everything after that unlistenable. I can't fathom paying a small fortune for (OH MY GOD!) re-mastered tracks that can be had for dimes and unreleased B- and (more likely) C-sides...