I bought this about two years ago and only used it at one gig and our singer accidentally stepped on it when he was freaking out on stage and broke it. So it has been in its box ever since because I was too lazy to take it apart and see what happened. Anyways last week I took it apart and replaced the foot switch and voila, works like new. I had only used it at one gig so I didn't really remember what it sounded like. I plugged it in with my strat and twin reverb and got the best clean tone I've ever had. It adds this awesome sparkle and compresses your attack just slightly giving a really smooth rich tone. Chords sound better, single lines, everything.
I placed it on my board before my drive pedals and noticed that it made all my effects sound a lot better. It added note definition and clarity to my blues pro and barber ltd. Then I tried it in the chain after the drive pedals and got the closest tone I've ever gotten to Larry Carlton. Amazing note bloom and sustain just on the verge of feedback. To my ears it sounded a lot closer to the Dumble thing then my Retroman Dumbox does.
So anyways, yeah I'm bragging about how awesome my tone is now I guess, but honestly, anyone in the market for a clean boost check this bad boy out. I don't think it would work well with a solid state amp, but it really adds a richness to a good clean tube amp. Could also be used to push a lower watt tube amp into natural overdrive.