I played one when I went back home for the convocation. I like some things about it, for example it was very LOUD and BASSY! You could adjust some of the quicks of the original Hammond, for example the key click and leakage. The feel was very nice as well, it was a very comfortable organ to play.
Complaints? Well, not as warm as an authentic Hammond. Still sounded very good, and very much like a Hammond, but it wasnt as warm. Also, how you switch between groups of drawbars was confusing, and akward.
In this order, is what I'd prefer:
1. Hammond that's been taken care of and maintained
2. New B3
3. Diversi
4. Hammond that's not been taken care of
Whether or not to add the XB3 to the list depends on how bad shape the non-maintained B3 is in