Earlier quoted context omitted.
Just curious, which Sennheisers did you give up on in favor of APP3? I have over-the-ear Momentum 3 and love it, but if APP3 provides better sound quality and better ANC I might consider switching as Momentum 3, while I love it, is bulky, heavy, and started to wear off and break down.
What parts are breaking down on yours? The earpads are of course replaceable, and if you had the awful loose yoke problem I’m guessing you wouldn’t be so calm.
Literally everything. The sound is still great and battery is awesome. But I doubt it will last long.
(Just to be clear: I've used it A LOT over the years, and is already worth every penny I spent on it)