I just changed the filters on my Etymotic headphones for the first time. It’s been years since I got them, and I’m an idiot for not doing it sooner. I had honestly forgotten that these things — anything, really — could sound this good. I thought I was just getting hopelessly old.
If you own a pair of these earphones, and have owned them for a while, go buy some replacement filters. I didn’t believe the manual when I read it, either, but this actually does make a huge difference. Wow.