btw, I have one. Decent little joystick. But GREAT for hacking the buttons and joystick.
I hacked it to my pc with a standard xbox-usb cable hack. The ps -> usb converter cables didn't work... But it has both, so hack the other one if you want USB.
The battery life is impressive. I use it once every 2 weeks and its kept the batteries for a year+
My biggest complaint is the buttons are concave out. But not a big enought deal to replace (still using the originals)... and the joystick isn't nearly a happs product... But again, replace shouldn't take much time.
btw, to get a real button in it, you have to remove the piece of granete they glued to the bottom to add weight. That give enought room for a real happs button (and replacing them all with black buttons would look pretty cool). I don't know if a standard super will fit in. I seen people replace them with those japanese joysticks with the yellow restrictor plates on the bottom.
good luck on your sale.