Is the MIDI CC mapping/learn pretty easy?

It is. I struggled at first trying to find the words "Midi Learn" somewhere, but then realized that all I had to do was right click and move the controller of choice.
One of my CME controllers is causing some weirdness, but I'm pretty sure it's in the CME not the B5.
I have to say, I load this thing up to experiment with it's features, but find myself "just playing" and forgetting everything else. I sounds like a real Hammond, and more than any other software organs I've ever played. Still can't weigh in on how it compares to hardware boxes, Mojos, HXs etc, but for tracking, in the box, it's wonderful.

Don't rush me. I'm playing as slowly as I can!