I checked out a RAT and a Boss BD2 yesterday and the RAT was far more versatile than the BD2 or any other Boss OD/distortion I've tried. I'm tempted to get one myself.

__________________
Gibson LP Classic, Fender Mexican Standard Strat, Ibanez S320> Dunlop Crybaby Classic, Boss TU-2, SPF Ego Booster, Keeley BD-2, EH Graphic Fuzz, Fulltone OCD, Boss LS-2, Ibanez AD9, MXR Carbon Copy, EH Stereo Electric Mistress, EH Small Stone Nano, Boss CE-5 in loop of LS-2 > Marshall TSL 122

Other gizmos - Boss OS-2, Roger Mayer Mongoose Fuzz, Boss GE-7, Marshall SV-1 Supervibe, Seymour Duncan Tweak Fuzz, Dunlop Crybaby, EHX LPB1 Nano, Boss DS-1, EH Small Stone, EH Holy Grail, Boss BF-2