Parasound JC-1 - How old is too old?

A local shop has a pair of JC-1s in on trade that I am considering. They are still checking with Parasound to determine when they were produced, but I'd like to hear from JC-1 owners (current or in the past) about their experience with these amps regarding long-term reliability. If anyone has re-capped their JC-1s, how old were they, and how much did it cost? Thanks for the help.