Finally got round to trying one of these after meaning to for ages after hearing lots of great things about it. Most people round here know I'm an od / distortion pedal junky, I've tried / owned a bunch - EBS, Fulltone, Barber, BJF, Black Box, Dredgetone, EHX, Hao, etc etc. My faves so far have been the Fulltone, Barber, Dredgetone and EBS. The Sparkle Drive is up there with the Fulltone as the best sounding overdrive pedal I've heard for bass. It's best as a mild od, adding some grit - it has that slight mid range hump you'd expect from a tube screamer clone but the blend lets you keep the low end. It's definitely a bit of a one trick pony, but it's a good trick etc etc. For the money ( I picked mine up for $75 used shipped ), it's great value - I'd recommend it heartily.