This thing is awesome. Lots of sweet spots and it goes from crisp 70's/80's distortion to the modern Djent style with ease. Super active pedal, loud as fuck but its a Keeley, so it holds its articulation the way a distortion pedal should, but most don't.
That all said -- and it most definitely is a vastly superior pedal to the MXR Fullbore in tone and versatility -- it doesn't come close to that Randall-amp like chug I was hoping for. That appears to belong to the Fullbore and the Fullbore alone. For me anyway, it's an unparalleled one-trick pony, but the one trick it does nothing else comes anywhere near it. I only need that super-chug palm-muting effect for a couple of spots in a couple different songs and that's it, but the MXR is a keeper because of this unique quality I found in it (with a lot of help from a PS-6).