I've owned the m40x since 2015. When I first got them I used them everyday. Now I listen to mostly my open backs.Just wanted to share that solderdude @ diyaudioheaven does a very good filter for the K371. He nailed the exact hi freq range to attenuate . Unfortunately, he can't filter the sub-bass as well (40Hz and below): he can do a bass shelf to cut some db, but from 100Hz down (which I preferred not to filter, I like bass quantity on the 371 down to 40 hz). With his filter 371 allows a very relaxed listening, with no fatigue at all.
Mind you, I only used them at home, so they don't have as much wear and tear as someone who might take them out and about,; but they're in just as good shape as when I got them. The hinges are just fine.
The akg k371 I've had for a few months and I've used them a lot at home and so far they're fine. Although I don't fold them, I just take them off and set them down as they are, until I use them again.
I'd be interested to try the diy filters just to see what I think.
I assume you can buy the filter from the diyaudioheaven web site?
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