Perhaps the "20-year" clock is when PS thinks it needs to be serviced and recapped. Which, in the greater scheme of things, if your hi-fi component only needs to be serviced once every 20 years, I'd say that is pretty damn reliable, especially if it means another 20 years of performance after said "tune up."
I would say the great thing about a company like PS Audio is that they're made in the US, and you call them up and get someone on the phone, and they can fix it. However, this isn't the case with many companies these days, as we all know.
