As long as I'm here: I've had the XB for nearly two weeks, and have used it at home and a few gigs. As mentioned my hope has been that the XB would be a "dUg plus": DP3X with more versatility. I haven't yet done a direct A/B of XB and DP3X, but I'm familiar enough with the latter to believe that the XB is what I hoped. I can dial in dUg-like tones with the added versatility of variable crossover points, and just as importantly, two independent bands of semi-parametric midrange instead of a single mid band switchable between two fixed frequencies.
An advantage to the DP3X is its simplicity (relative to the XB!), but it's not easy to avoid the signature scooped dUg tone. With its variable filters, the XB can get dUg style tones with more mids.... and a whole lot more. Last Saturday's gig was with a band that plays a lot of classic pop, no heavy rock. So I dialed back the Drive, overlapped the filters, and got a traditional punchy and mildly-overdriven tone. Playing harder rock, I did my usual thing: dialing in heavy dUg-style clang, and softening it to a cleaner purr (if needed) by rolling back the passive tone control on my bass.
Important note: I've spent very little time outside of crossover/mix mode. Same as the dUg, I'll use the XB as a crossover dirt machine. Point is, I am not qualified to comment on clean channel, dirty channel, or non-crossover mix mode. Also, there's so much to do in crossover mode that I won't get around to testing those other modes anytime soon, if at all, so I'll leave it to others to comment on those uses. Bottom line: I am finding the magic in crossover/mix mode.