I've had a chance to play that WW Ultra I got from nonsqtr the other day, and I'm more impressed every time I put a signal through it. You know how sometimes you get a new piece and it kind of blows you away at first, then you go back and listen more closely and you can start to pick out the flaws? Not on this one. I have a D-210XLT sitting on a D-115XL in my practice room, and it usually sounds OK, but isn't really "my sound" (I like the D-410XLT). With the WW these cabs sound amazing together. Yes, even better than the WT-800. Plenty of volume, gobs of bottom ... I don't know what this talk of weak bass is, but I sure don't hear any evidence of it. This one is going to see lots of gig time ... assuming I get a new gig. Walter seems to have kept his Q values fairly narrow on the EQ section, because you can really dial in some very specific tones without one EQ band hijacking another and creating mush. You have very precice control of the frequency adjustments. As many have said, it's a very clean amp and uncolored (to my ear), giving back the sound of the bass driving it. I've tried it with the Sadowsky, Lakland, Fender Jazz FMT, Fender RB5 and Zon Sonus, and each has its own characteristics ... just the way I like it. I'll have to dig my SR5 out of the archives and see if this amp is a good one for it.