It's not muddy, at least I didn't find that, but it's just TOO tight for leads IMO. The JB is so awesome for leads because it has that looseness, the Distortion not quite so much (but better for palm muted rythm as a result) and the Invader even less so because it's so tight. But that makes it the rythm pickup par excellence for the old chugga chugga stuff.