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I got this pedal back when Blackstar only made pedals -- not the amps which I'm not particularly a fan of -- and I was intrigued by the concept of a valve-driven pedal. Not surprisingly, it sounds much fuller and fatter than just about any other distortion pedal I've used. That being said, it has a very distinct sound that doesn't exactly try to be anything else (no emulation or modeling here, really, whether that's on purpose or not). It has great medium to high gain settings, hovering somewhere between the tone of the old 5150's and the Mesa Boogie Mark IV, but almost more compressed and chunky with some settings. I use this all the time for rhythm and leads, and it works great when paired with overdrive or boost pedals to get a super-saturated sound.
I was lucky enough to be given this for free! (A friend of mine replaced it with a Fulltone OCD for some reason) so that's a plus. It has two useful distortion settings, one of which I use for semi-transparent overdrive and the other is to blow my band mate's ear drums when they least expect it. It's a very high quality pedal and produces warm tubey goodness, it does require a 18v power supply so that shook my board up a bit...