Thanks for the detailed reply. But that car reference again... I find it irrelevant because we are not talking about cars. Also, I don't like cars and I, thank God, don't have one. But I like headphones, and to me, units that have absolutely different cups aren't the same model.
You emphasize that I bought it second-hand, as if it changes something. The fact is, the guy I bought it from didn't know he was buying a modified version. This is what I'm talking about. You didn't inform him. Otherwise, he might not have bought it. He received an enhanced package (an extra cable), but he didn't receive information. I enjoyed your Magnis, but this non-informing is questionable, can't see how it can be called "honest with customers". I like that, you sell a modded HP to an unaware customer, and when the second owner finds out about it, you say it's his problem because he purchased it second-hand. Yes, you might be putting some extra honesty with international clients, but it seems you don't care as much with your local ones.
Also, could you ask your junior colleague to remove my personal details he posted out of spite on a Russian hi-fi forum? Thanks!