very quiet, very clean when you want it to be, and the toob is good for adding toobishness.

couples very nicely with
my studio projects B1 and i used it this weekend in conjunction with my rnc and re38 and laid down some pretty nice sounding vocals.
i use it regularly as
a bass preamp, mainly b/c it sounds better than having it just go straight into the board. i run a mid-70's fender precision into the vtb1 into
a symetrix 425 (compressor) to tame the levels some, and it gives a pretty punchy sound (i dig it if anything else) and if i really want that allen woody style "overdriven ampeg" type tone, just dial in some toob (anywhere from 10:00 on). i'm sure there are far better bass di's out there (and i've got my eye out for one) but the vtb1 does an ok job on this bass, for this band.
i have to admit being surprised when using it for a guitar di. i plugged my 89 american tele into it, switched to the neck pickup, dialed in a little toob and it had a very warm, bluesy sound to it. not something i'd use every day, but a definite pleasing color. too much toob, though, and it goes to shrill, thin nastiness (as most toobs do).
i don't have a c1, so i can't vouch for that, but for your $125 or whatever, you could do a lot worse, that's for sure.
wade