Hello George
The GEM WS1 was a hit when it came out, there are 2 versions: one with a floppy and one without, you can NOT add a floppy drive to the one that doesn’t have it, musicians favor the floppy version, styles and sounds are editable, I owned and sold many of them, people until these days still look for them every now and then, the WS1 has on board quarter notes, it also has a nice demo, the Roland E40 OR styles sound better but not the sounds, The WK2/3 oriental sound better than both WS1 and E40, in my opinion the WS1 is worth about $500 to $600.
Thanks
Eddy