The Uberschall has always been really interesting to me. I've always liked the controls on the amp as well. It's always seemed like the Mid knob was more like a Treble control, the Treble was more like a Presence control, and the Presence was more like a Contour knob.
It's a great amp though. it has a really fantastic voicing that can be made to sound agile and like it's roaring fire, like a high octane jet engine or something, or it can be made to sound like a driving, unstoppable force, like a planet-sized chunk of iron hurling through space.
And playing one in person is a vastly different experience than the hyper-scooped, max-gain sizzle type of tone the amp is usually recorded with. I mean yes the amp can obviously do that sound, but there are also a ton of well-voiced mids on tap as well if you want them. The amp can do a lot more than it gets credit for. It's not exactly super versatile, but within the confines of "crushing high gain" territory, it can actually cover a ton of ground.