How much is the B3 and the Neo selling for?
I've never used the Neo Ventilator, but everybody I've heard of who's heard is says its a great device and says that it gives the organ some great 'bite' when there isnt a Leslie to plug into. Also, I've heard it can make an organ clone such as a Hammond Xk3c or Nord plugged into a regular speaker or Leslie sound very close to a B3. Many organists who travel often carry a clone and plug it into the Neo and some regular speakers and get a very solid sound.
There are plenty of videos on youtube reviewing the Ventilator
Neo Instruments Ventilator review (Leslie 122 simulator)
Neo Instruments Ventilator vs a real Leslie 122
Whether you buy the B3 and Ventilator depends on the cost and condition. Some B3's are in bad shape and fixing them would cost as much as buying one in already good condition.
