You have to check around what transport mechanism they are build. Some of them, like CDM-9Pro used in Theta Basic I/II, PS Audio Lambda and Krell KPS-20i among others, are no longer available, and to make things worse, the spares are depleted.
On the other hand, Philips CDM-4, CDM-12 or VAM1202 are widely availeble and cheap as dirt, so I would not hesitate buying a transport build around one of those, even if it was a few years old.
On the other hand, Philips CDM-4, CDM-12 or VAM1202 are widely availeble and cheap as dirt, so I would not hesitate buying a transport build around one of those, even if it was a few years old.