I've listened to them all. Basically, the only unbiased way to do it...

I truly believe that, if you can't record something on a keyboard that sounds great played back at home (don't forget, I'm using a MOTU 24bit converter to play back computer audio through a pair of Mackie HR824's), chances are. it's not going to magically turn into something great when you get it home. Just a slightly bit better fidelity disappointment the original demos were.
I've heard the factory styles demos. I've heard the factory T2 demos (still waiting for an extensive set of T3 ones to be put up, hint, hint...

), I've heard the PA2Xpro demos, and Ketron too (to be honest, Roland don't have a lot of straight style demos).
Wersi doesn't impress me in the slightest. I am wondering what anyone is listening to that IS impressing them..? Stock Wersi sh*t, give it your best shot...
Wersi make really great organs. No argument (other than, I like the Hammond sound over the Wersi any day

) at all. Trouble is, organists keep reviewing their arrangers. I don't see anyone posting ANY great Wersi music they have done here.... Now, are they all shy, do they all suck, or is it bloody impossible to make something as good as the 'average' player does on a T3/PA2xpro, etc.? Me, I'm inclined to believe the latter...
Until proved otherwise.