I do like 'em.... and just completed my collection... (I'm still searching for a NOS ShredMaster with Box but the one I got now is a nice substitute... just a new footswitch - BluesBreaker and DriveMaster are both mint and with box and manual)
Although I never played with any of these pedals, I really dig the look of 'em. Also a fourth pedal, the old model Guv'nor really seems to have a great "Marshall-in-a-box" sound to it.
The original guv'nor was a good pedal... i had a lend of one years ago for a couple of weeks...went well with my OD-2 but mate wasn't selling...........i never got chance to check the others out....
BluesBreaker is a mellow and pretty tame overdrive pedal
DriveMaster can go from nice smooth overdrive to nasty crunch and leads...
ShredMaster is a smooth HighGain distortion that's not really a shred pedal but a modern sounding distortion unit with a cool EQ (love the contour control)