Finally got to try out the XB Driver with a Dingwall Combustion. My expectations were largely met and I was able to dial in a variety of nice tones, from clean to filthy. Coming from the DP-3X, I was a little surprised at how neutral the XB Driver sounds; in comparison, it seems much more like a blank slate, a mixing palette for bass distortion tones.
Only spent a small amount of time on it, and found the Pre/Post midrange EQ is very flexible for tone-shaping; you can boost a part of the midrange for a sort of wah-distortion effect, or just to add little push or cut in certain areas... sweet. Also nice is having separate EQ for the Clean the Drive paths, allowing the ability to add some heft to the distortion, cut the mids on the clean, or whatever. And, yeah, I spent most of my time in Crossover Mix mode... that's where the money is.
That said, the Clean and Drive channels sounded pretty good by themselves, again fairly neutral until knobs get twisted. Overall, I'd highly recommend the XB Driver over the DP-3X for anyone interested in bass distortion, but not necessarily wanting to focus on dUgtone. The XB Driver is a more neutral, flexible, unit, a bass distortion Swiss Army knife... or maybe a Ginsu, depending on the position of the Bite switch.
Yes, the Dingwall Nolly sounded great too. Was fun playing gnarly riffs on that pianolike low-B. A match made in Metal Heaven.