Okay, time for a few more thoughts.
For the record I am very cautious when it comes to this stuff as I don't have the money to keep changing things around; if I decide I will keep this I will have to sell off several items that I really, really do like to help pay for it.
First thing I noticed was that it is pretty even throughout the range. My only experience with a three way is the AvatarTB153, and that cab has an overly pronounced tweeter to my ear, I always turn it way down or off. Xsonics I can turn it up pretty far and, though it is noticeable, it does not "jump" out at me nearly as much. The mid is very smooth. When I blow the mid fuse on the Avatar it is terribly boxy and bad right off. Xsonics really does sound good with it on or off, though I prefer on due to a bit smoother and slightly more punchy or powerful in the upper mids.
On my Laklands I usually have my mid range set ~250 or so and has worked with all my cabs with a slight boost. Xsonics needs it flat or just cut there so far, which could be the cross fire is bumping in that range though I don't have the technical background or ear others do to difine this. No big deal at all, just something I noticed and sounds great. It is just about getting to know a new cab.
One thing I did find interesting. On my Streamliner, with about 4-5 different cabs now, I never kick the gain up too far into distortion/breakup. Just don't like the sound at all. With this cabinet I cranked it up way farther than I ever had before and still really like the way it comes across. That I can't explain but find it kinda cool. I have always been a very clean tone nut but understand the usefulness of a bit of overdrive in a mix but have never found a way to do it that works for my ears.
All in all so far so good. My tonal preference is old school meets modern. I use TI flats on an active bass. I don't want to be flubby in the low end and I do not slap. My upper runs I don't want to bite so much as be powerful and musical with singing qualities. The low end I want to punch and have definition with depth. I play classic rock, to alt county and Americana type stuff. So far this cab seems to mix with that idea. I do think it is laughing at my 600 watt Steamliner though, as if a little kid down the street came over to play.