I had a chance to play with the SBVT a little more before (between ending work and heading out for dinner) and I gotta say that it sounds fantastic. You can definitely hear the SVT roots in it - it's got that classic rock tone. Gain low, it's smooth, has a little bit of that SVT bite. Throw the "ultra low" switch on, and you get that nice SVT grunt, the "ultra high" switch gives you glassy, airy highs and robust harmonics. My preference ATM is "low" on and "high" off.
The EQ works great, it's responsive, but also in some ways a little subtle. As mentioned, it's very clear and smooth at lower gain positions, but at higher gain it gets some good OD (for me, with an active Sadowsky NYC) once I get past 1:00 on the gain knob, i start to hear some good OD which eventually turns into that classic SVT grind that we all know and love(more gain = more grind). It doesn't get into fuzz territory, but it will do a hefty grundy (that a combination of grindy and grunty) that put a big smile on my face.
One thing that is nice is the 8 position switch, it is really helpful in finding the right mid freq boost to enhance a fretless.
I need to spend more time with it, but all in all so far it's a winner. Also - it's dead, dead quiet. No noise whatsoever, which is amazing since i live about 500 feet from the WWOZ broadcast towers.