It's encouraging that some are able to take advantage of this feature. I pretty much listen only to CDs anyway, so I don't need mobility at home. It doesn't have the isolation I would need for work. So for me, it really has to stand or fall on merit, and not on add ons. And given the big disagreements about the sound and production quality (and the fact that there's a new flagship currently in beta mode but definitely in the wild), I want to wait till I hear it within the coming months. Still wish it had velour or K501 cloth earpads too.
Looking forward to your thoughts when you get to hear the AKG K812 and how it compares to the old flagships that you own.