25 years ago I needed a pair of studio headphones, and after exploring all the music technology stores (no internet!) I bought a pair of AKG K240s. Not cheap, but worth every penny. I thought they would last for ever, but a few years ago my son started borrowing them for gaming, and as the crimps in the cable accumulated they eventually gave up. Unlike in the new version, the cable could not be replaced.
I assumed that technology would have moved on, so I tested some new makes and models at comparable prices, and was disappointed. They sounded good but were uncomfortable, or they sat nicely but the treble was harsh, the bass booming. Eventually I reverted back to the K240s, with their comparatively dull looks, and it was a revelation, like discovering the obvious all over again. So comfortable that you can wear them all day and fall asleep in them, bright high ends but not harsh, clear bass, and totally neutral - you hear the music the way it was recorded.
AKG have made a few subtle tweaks, but externally they are identical to my first pair - and 3 decades on they still set the standard.