I have a 50CL but instead of a graphic EQ, it has an EF86 tube powered spring reverb.
I think the cleans are always a sacrifice on it, since both channels are effectively identical, but thanks to the switches and more/less gain thing you can clean one of them up (and on the 50, you can have it so the red channel uses the tube rectifier but the green channel uses the SS, which is cool). I also had a PIttbull 45 and played a 50/ST a bunch and those have more dedicated clean channels which are superb, so I suspect the UL/Classic (which I've never had) are great for that too.
Seriously one of my all time favorite amps, if not my favorite amp for "my" tone. There's just something really cool and unique about it that really speaks to me every single time I play it. I would love to have one with the GEQ someday for even more tweakability.
The only thing about mine that I find interesting is that the boost function does not add much gain, and I am usually running the gain maxed already (which is part of it, since the bright cap is effectively "off" with the gain set that high). With the gain maxed, it's still nice and tight, but it's very dark, so I have to run the treble/presence up a lot. I'm not complaining, I love the sound, but definitely one of those "tweak with your ears, not your eyes" kind of things. It's also why I suspect the GEQ would be great for me, since I could bring it just a little more hair if I wanted to.
Of course, rolling the gain back a little makes it sound less congested, and then I can throw in a boost to get some of the punchy palm mutes back. I really like it both ways, and since both channels are the same I also can set one up "amp only" and another where I expect to turn on the boost, same gain level, different texture. Love it.
If I had one critique, for an amp I otherwise can't say enough good things about, is that the spring reverb in mind has a fairly short tail and is a little bit "reflective" for my taste. It's great for adding just a touch of ambience, but if I mix it a bit more, it's a little too busy sounding for me. I could probably swap the tank for a longer decay version if I cared enough, but if I were going to use the reverb on a clean-ish setting and I needed a deeper verb, I'd want to use a pedal for now.
Enjoy that amp - really killer.