Thanks Jazzy!
Just back from a long summer vacation. Only have had a chance to use the Superfilter for one gig so far and it performed admirably. I found the band-pass filter to be a big help in bringing out a bit of bite in the upper mid-range. I used the low-pass filter to beef up the low end a bit but my Series bass already has a strong bottom end, especially since mine is an old one with the neck pickup located closer to the neck, so I used a very conservative gain setting. Lots of ways to patch it into my rig and various preamps so I am looking forward to experimenting more. I think it is going to be a particularly good thing to use with my F2-B. Last gig I patched it into my Eden Navigator effects loop in mono and left all the EQ on the amp flat but I tend to use little to no EQ anyway.
Already got the sense that subtle is the way to go with the Superfilter. I always gig with at least one 15" JBL cabinet as part of my backline and it handles low end a lot better than my 10" speakers. Since I mix cabinets I am also going to try running the filters in stereo at some point so I can tweak each cab separately.