What's likely to go wrong with a used CD player?

I came close to buying a ARC CD3 that was about 5 years old, had been "well-taken care of" by the owner and he assured he had operated it properly as per leaving it on 24/24. He has been the owner since it was just a few months old. But I just couldn't pull the trigger.

All I could think of is sure it's been problem free for 5 years, but the problems start after I take it over.

So considering the reputation of ARC gear, build quality, yada yada yada, and that hopefully it has had a good home, am I worrying needlessly and passing on what seemed to me to be a pretty good deal.

My primary interest in this player, other than the fact that it is an ARC is I'm looking to upgrade from my Rega Apollo to a balanced CD player to go with my upgraded system of a balanced preamp and balanced power amp.

Thanks for any thoughts,

Gene