I have the Programmable BDDI (same as the BDDI above, but with three channels) and the VT Bass.
I use the VT Bass on 75% of the stuff I do. However, I occasionally use BOTH.
I have a channel on the PBDDI set up to boost the bottom end of the VT. It sounds pretty fat and filthy. It sounds great in the right context.
I could live without one of these boxes... but I don't have to.
