I just managed to buy an SC-55 with control firmware 1.10 in a local pawn shop .
- Display backlight is OK, but LCD text is rather pale
- 1 or 2 of the front buttons don't work
- Battery was still in but had not leaked (removed it).
- it was covered in stickers and adhesive velcro pads
- it was filthy
Otherwise everything works fine in terms of MIDI and audio out .
I don't plan on replacing the micro-switches for the bad buttons (as long as power works, I'm happy), but I might end up trying to determine why the LCD text is so pale (not that I really care that much either, TBH ) .
At first listen, it is quite similar to my SC-88VL in SC-55 mode, at least in Duke Nukem 3D .
Anyway, for 80 CAN$ , I think it was quite reasonable . I can't realistically expect perfection for a nearly 30-year old piece of hardware and at that price .