Wanted one for a while of these for a while but they are rare as hen's teeth around these parts. When this one popped up I pounced on it. So, what can I say about it? Only a little bit for now, I haven't had it long. The amount of low end this thing can push is amazing. There's a reason fans of all things heavy praise these amps. It makes fuzz pedals sound like an earthquake. The EQ and mid-boost offer more versatility than I would have expected but each setting on the mid range switch has a pronounced midrange frequency that always voices the amp around that frequency. That's a terrible description but maybe someone else who knows these amps can explain it better. The headroom is immense. No shock there. In typical Sunn fashion it's already exceptionally loud on 2. Maybe my opinion will change after I spend more time with it but right now I would say this amp does a few things especially well but it's not going to be your Swiss army knife of an amp. It's not for everybody. In fact, it's probably not for most people but for a few specific applications it's badass. Also, definitely do not pay the insane prices people ask for these things. They are, IMO, just not worth it. I waited a while to find one that was decently priced and I turned out knowing the guy who was selling it. He gave me a good deal. I think people asking 2500 or 3000 for these things are shooting for the stars. There are still deals to be had if you are patient.