I still love my ER4XR. One of those headphones/earphones that you could live with as your only one if you needed to just because it does so little wrong.
After 4 months of use I still was a little iffy about the fit and comfort of the triple flange tips. Some days they would feel totally fine and other days they would almost hurt. Decided to try the dual flange tips that came with my set and I don’t know why I didn’t do this sooner. Found the small sized ones to fit best and now I love these even more.
For one thing, WAY more comfortable and much easier to insert. The sound is a little different though. For one thing, they sound a little more open and airy, and the treble sounds a little less dark, making them seem a little wider. Mids are about the same but the timbre is a little more natural and with more clarity, maybe just a tad less warm. Bass seems to be a little reduced in comparison. I normally felt that these had enough all the time but now I find it lacking just a little on some music. Fortunately, these things take to a bass boost on my Fiio so well, way better than other headphones I’ve used.