Yes... in my example the preamp has rescued my bass, from being a boring, non-discript sound sh*ter to something akin to god! It was prolly a mistake to put the DiMarzio's in, but to be honest, it had nothing going for it except the vintage vibe and superb neck. I do a lot of gigs with it through the board and always get a great sound from it now. I don't find I need to do a lot of fiddling with it. I've got it dailed in just right, although it's nice to be able to tweak it to compensate for acoustics and such.
I couldn't be happier!