If you're looking for a controller to improve workflow, I'd read the faderport docs and check the presonus forums re compatibility for your use. I understand it's a decent piece of equipment, and it could avoid some use of a mouse, at least for mixing, plus the need to switch to the mixer window. At $199 new, there have to be some used going for far less.

Actual physical mixers on the other hand are rough anywhere south of $1k, and analog mixing is shit unless you can find an old studio quality board that isn't damaged, though most good analog boards will need dual 220v and functional power supplies.

I tend to avoid mixers. I bought the x32 + the midas box for getting my kit on tape. Aes50 (ethernet) midas box (in sound room) -> board (in control room) -> rednet/dante (ethernet) -> cpu