I just honestly can't see how people enjoy on-ear headphones. Sound-wise I have no problem with them other than the lack of isolation you get with IEMs or over-ear, but even good pairs just feel super uncomfortable to me.

On a positive note, I'm still madly in love with my DT990s and I recently went back to a few older Sennheisers (HD419 and HD428) I have kicking around and I can't believe I even used those before. Open cans for life (at home, at least). Looking into getting some IEMs for on-the-go soon, too. I've heard nothing but praise for the Shure SE-215 (and everything else Shure makes, really) but I think I've read they're discontinued now? So if I can find a pair of them on the cheap I'll jump on it.