You are essentially getting the equivalent of 8 pre-amps since you have 4 channels, each of which has both a tube and transistor signal chain. These can be run independently or blended. I find I prefer a 50:50 blend for a perfect mix of clarity and warmth. This preamp is typically of the high standard UAD has set for decades.
I will be honest. I really cant tell the difference between the tube setting and the solid state one. I just set it half way and use a bank of 3 of these (12) and something else for overheads if aI have a particular client who want a 1073.
But what is a 1073. A very small amount of circuits. Basically very little going on there. I use the lunchbox Neves a lot though. It is easy, and it says "Neve". But honestly, it all sounds pretty good to me.
I have had some of the biggest audio snobs and dudes with scopes will me if it was a Never, a UA or an ART mic pre and no one could tell me the difference. At some point we need to get past "the gear" and make some music. A lot of cats spend 90% on gear thoughts.
There is a "cost to benefit ratio'. How much you spend vs how much benefit you get from the extra cost. I think once you cross the thousand dollar mark, you are in safe territory. A 414? a U87? At that point just get to work and make some magic.
I have a daughter. he is brilliant in so many ways I can't even begin to start. But her very best trait is: her resourcefulness. She seems to make the best from whatever she has available. If the end of the world arrives, I don't want to run to the dude who has planned his shelter, I want to run to her - though she has no knowledge of survivalism (nor do it). But the survivalist will have forgotten something... she will be able to improvise.
Maybe we should not treat gear as survivalist, and start being resourceful. Make music today, not "once I get a better piece of gear".
I have some of these mic pres, love them. I also have some Neves, and a couple of other ones. They are all good. but at a certain point we are all just smelling each other's farts and saying its roses aren't we. Let make some magic today, with what we have, and with who we have.