Here are a couple of short clips of some of my favorite sounds so far.
P bass with flats - Barbershop - Radial JDI - PC.
The clean track has no effect.
Little Dirt has the gain at 12:30 and the Sag at 2 o'clock
Dirty Gain at 3 o'clock abd Sag at 11 o'clock
But as I said before the magic really starts to happen when this effect starts interacting with your tubes. This demo shows how transparent this thing is though. It really does not change your tone very much.
http://www.soundclick.com/barbershopdemo