A great organ module for the money. I bought mine mint used for $275. But mine is a Viscount D9e. Viscount makes all of the Oberheim organ modules. In Europe they market them under their own name (like mine). In the US, they market them through Oberheim/Gibson. The only difference is the color. The D9e is dark brown instead of cream white. Otherwise it is identical to the OB-3 inevery respect.
Now for sound: It has tons of polyphony; the manual doesn't say how much, but I can lay my whole arm across my controller keyboard w/o any notes dropping off. The six presets are pretty decent, but I mainly use the 9 drawbars to shape the sound they way I want it. The leslie simulator is xlnt: fott-swtchable and it winds up and down gradually, just like the real thing. But it's still not quite the same as a real leslie. Through a leslie this thing is awesome. It also has all of the percussion and click buttons you would expect. It also has distortion that sounds good if it isn't set too high. If you set it too high it begins to have that "solid state" buzz. For recording I play it through a tube preamp.
As a blues palyer, all I need are good piano, wurly, rhodes sounds. This organ module takes care of the rest. I'd buy it again.