It's in great shape. No scratches. The backup battery is dead, but it is just a coin type battery like a watch battery you can pick up anywhere. If I have time before I move, I will probably pick one up for who over buys it. The rechargeable battery stills holds a good charge, but I never used it long enough to find out how long the charge lasts for.
It comes with the cradle, usb cable, charger, and soft carrying case. I am also throwing in a 32 mb compact flash card.
It can accept either any GPS device that will plug into the compact flash (CF) and SD slot. That is another great thing about this device is that it supports both compact flash and SD cards. That way you can have memory in one, and peripherals such as a GPS or WiFi card in the other. If it was me, I would get a CF GPS for it, just because the CF slot is on top, and the SD is on the side.
Another great thing about the Cassiopeia, is that they controls are all laid out in a manner that you operate it with one hand. You don't even need to use the stylus, it has a button scroll wheel on the side that makes operating the thing a breeze without the stylus. If you do choose to use the stylus, the freehand recognizing is great, you can just write away, like you were writing on a piece of paper, and it will pick it right up.
Check your PM for info about the software.