I have shared this in some other posts as well, no offense on marantz as a brand but do not recommend the latest offerings from marantz especially 5005 and 6006 cdps. They offen skips, stops playing or shows no disc eventhough if you feed a brand new original disc at times. I tried these marantz from various places and all behaved in a same manner.
What i liked so far by owning and visiting a few friends places are audiolab cdt6000 (i own) , vintage philips cdp and a vintage marantz cdp. Unable to recollect the model names of the vintage cdps mentioned currently.
They play even scratched cds without any struggle (infact the philips model played a partially broken cd as well - not exaggerating) and more importantly they output much cleaner than what the new marantz produces.
No harm in trying used players, provided if you find the genuine spare parts available in the market.
Better to get the players checked whatever you are going to buy otherwise please go with owners experiences with the players mentioned.