If you're looking for a clone of you-know-what or for an amazing pedal that can go from clean boost to creamy overdrive and everywhere in between, THIS IS IT.
Amazing, amazing, amazing.
I use it as an always on, just barely dirty boost to drive my signal to the amp and into my other overdrives.
Very recommended.
Oh, and it's buffered bypass, excellent if you're running a bunch of true bypass pedals after it.