A friend of mine had purchased a V70 used and he did not like the sound in his room with his speakers so it went in the closet for 15 years until he decided to part with it. He listed it on Canuck Audiomart and it sold within a couple of hours of being listed.
You seldom see a Classic 30, 60, or 120’s for sale on agon. I haven’t seen a pair of 120’s listed here in recent years anyway. The V series is actually the Classic series with balanced input and was not in production for very long before being discontinued.
Speaking with Chris Osanna at ARC a few years ago about using KT120 in the 120’s (which he did not recommend) he was telling me that they rarely see any of the Classic series amps coming through their repair shop other than for tubes and filter caps replacement.
He said that those were probably the most reliable pieces (built like tanks) in their amp line. I can certainly vouch for that with the experience I have had with mine.