I use the NI B4 on stage through my laptop and it fools a lot of people, it never crashes, works as a stand alone program, has user programable preset's and comprehensive editing facilities, a great leslie simulator, super eye catching graphics and the importing of different vintage instruments option plus unlimited polyphony.
Do you think you could tell them apart in a band situation???
Personally I think the B4 is hard to beat consequently I shall be using my B4 for the forseeable future.

Larigot