You are getting a virtually brand new organ as I am the original owner, having purchased only several months ago. It is in "showroom" condition (actually even better as I am the only one to have put my hands on it). Played entirely at home (smoke-free house)...never moved or gigged with.
It is a fantastic organ (in some user's personal review they liked it even better than the XK5). It does have a newer sound engine, and I believe an upgraded Leslie and perhaps a more streamlined editing approach versus the XK5. It has very deep editing available to you if you desire, but it sounds terrific right out of the box and just using the on-board controls.
The XK4 has models of various Hammonds, along with Vox, Farfisa and Acetone, as well as pipe organs.
All programming/editing is done on-board, no need for computer or laptop.
If there were more hours in the day I would keep it, but I have spread myself too thin and just don't have the time to justify this expense. (got a little carried away by gear acquisition syndrome).
Included is the Hammond EXP-50J expression pedal and FS9H footswitch, both purchased with the organ brand new. Extended user manual and power cord of course. All in their original box and packaging.
It's not cheap, but you get what you pay for. I believe they are currently selling for $3495 in store, and that is without any pedals. You are getting a good deal here, as I will also be covering the shipping and insurance cost.