I have owned the HD621 for 6 plus years and for M to offer me any kind of a trade in on it I feel is generous.

If someone purchased it within the last year they can get a full retail trade in that’s also very generous (regardless of the cost of the replacement product).

Not too many audio companies do that.

My gear: Trinnov CI, 271, 8000.1(SEs), 7200.1 HC (SE), 320s, 3200s, Seaton F18 subs, MS200 (2nd zone), 218, 210.
Other: JVC RS-4100 projector, Lumagen Pro Radiance, Panamorph DCR anamorphic lens, Stewart G4 130 screen, Kaleidescape Strato K, Rvolution 4K player and Zapitti NAS, Oppo BDP-203,Roon Nucleus