I got the Tank B, and most of the preamps are not great, but you can download profiles for other amps, and they sound good. I updated it with the ones I like, same for the IRs, and I've been using it a lot, even for gigs direct to the house PA. So, having said all that, the Black Box will serve you well.
As for the Sonicake, you can load NAM captures (full rigs) for bass. It works really well too.