i actually went the same way - from tube screamer and blues drive to full-drive II... i kept my blues driver, however, its the keeley mod and i just can't bring myself to part with it... but yeah, what a great pedal, so many great sounds, and so versatile, with the different modes and stuff. my only beef would be the drastic level changes when switching from the 'vintage' and 'FM' modes to the 'comp-cut' mode... unless i'm not understanding something correctly. the sustain in the vintage mode is to die for though.