I have one that is modded, but I only modded it to start experimenting a bit. There was never anything wrong with it in it's stock form, I just thought it would be cool to tinker around with it. I'm thinking of putting it back to stock though.
My only "mod" is to have the tonecontrol fully counter-clockvise, it�s too trebly in other settings. But I like this pedal a lot, one of the best overdrives I�ve tried.
One of the changes I made internally is in regards to the tone control actually, but I took it a bit too far now and even when the tone control is up to "10" it doesn't have enough bite. I'll have to investigate that on mine.