I got one of these (4 knobs, not lights in the mask) from a TB'r and I'm really loving it. I don't play a lot of heavy stuff anymore, but my god this tone is so grindy. I love it with the gain maxxed out after the OC-2 for a crazy synth tone, but I also am really liking the gain lower at 9 o clock, volume a little past noon. I have the bass at 10 and treble at 9. No idea what everyone's settings are as I have not read much of the thread but the lower gain tone really puts the bass in the front of the mix, and I feel like I may be able to use this for more than just a synth tone, but also as a cool drive tone on some fusion tunes as well.
I usually run mine at lower gain as well. Around 1 or 2 o'clock. It sounds so good way up there though and I will crack it every now and then. It's really hard to pick a gain setting where it really shines because IMO, it shines at most spots.
The biggest reason it stays on my board, the low end is super fat and juicy and that sag is just to die for. It gives it this really cool quality that only comes from a rat. It sounds like tubes to me too. But the uniqueness of the flavor and response have also gave it a solid and steady spot on my board through all the flips and swap outs I've had since I got it. It's so good and unique to my ears, that I keep two rats on board because of it. The fuzzro rat tail I have is just as awesome but in a different way. They are the two best bass rats around IMO. There are a couple others that are very good, but I feel like I have the top of the heap with those two. And now idiot box is coming with another one!! The Landphil. It's a souped up more tweakable blower box. I mean, come on! What more could you ask for?!!?! God I need that pedal.