seriously this thing kicks so much a$$. it really is the boost/drive i was always looking for that a tubescreamer never gave me. i love tubescreamers for what they are and will always have one on my board, but this BD 2 is something that you really need to try. i have tried many different pedals and this one does it for me. compared to a TS type pedal its a good bit more transparent due to less mid boost. it adds just enough for me with all knobs at 11 o'clock and ill kick in a cae/mxr clean boost if i want just a little more. for all you mayer tone freaks this one is the closest thing ive heard and i know he uses one and will kick in the keeley kantana clean boost in front of it for a little more so very similar. anyway just wanted to share my own thoughts, i can comment on the unmodified version i just know that Mr. Keeley knows what he is doing obviously and i couldnt be happier with this product, give it a try.