I had a G800 several years ago. It was HEAVY and had big ol' weighted keys. It had many operating flaws, including inability to remember transpose in the registration memories. It did, however, have some great sounds and good drums. Also some good styles. I had changed to it from Technics and I remember how neat it was that the sequencer recorded in GM format, not proprietary as the Technics did (does).
I also liked the ability for various keyboard split option, and the way the volume pedal could be used to fade in and out two different sounds.
I would buy one for $100 and leave it at home for the kids to play with.
DonM