Could have issues with sled drawer motor, drive motor, any rubber parts. I would pass on any old CD transport. Too many potential problems that could be costly or impossible to fix.
I haven't looked, but I think there a good new transports available. Any high end CD/Blu Ray player that is well built mechanically should provide years of service.
http://www.audioadvisor.com/prodinfo.asp?number=NPCDT8
http://www.audioadvisor.com/prodinfo.asp?number=WAWTP1