I notice a very tiny drop, which is weird because it has a volume knob. I wish the volume knob provided a much more hefty boost than it seems to. I have it maxed.I got mine yesterday. Got to try it out today, although not in optimal context (my soul band instead of my post punk band).
I noticed a slight volume drop, but I didn't have a chance to fiddle the knobs, so I'm not 100 percent sure about that drop.
Will report back on Sunday when I get to try it out in proper context.