On the unit/units you are considering - do your research. The internet is a great source of info. for personal reviews regarding the reliability of performance of just about any unit you may be considering.
A few years back I purchased a used Cal. Audio CDP. that had several positive reviews that gave this unit high praise for having great sound. I Purchased the unit for around $500.00 (a good buy considering the original MSRP and great reviews). I was not disappointed in the units sonic performance - in every respect above my other CDPs. After 6 months of enjoyable listening, it stopped reading discs. After researching for repair options, I found only a few that would and that the repairs would be expensive, with no assurance that the problem wouldn’t repeat. Doing a little digging and reading many personal reviews, after the fact, I found that this was a common failure for this unit. I found that there was also high rates of failures in the drive and LASER units of many of the other high dollar CDPs of that era (early to mid 2000s). There are not many, if any, of the CDPs of that vintage, that I would now invest much money in - regardless of how good they might sound.
Do your research first and see if others experienced a high rate of failure and repair issues with the unit you’re considering......Jim