Dang. Y'all weren't kidding when you said the ZS3E/etc were basically musical earplugs. Had a bit of leftover eBay bucks and decided to pick one up because I was bored and curious. Settled on ZS3E because the ZS4 had BAs and I wanted to mess around with all-DD, and *E because it was clearly superior (and came in red).
Haven't actually spent much time listening to them but they seem perfectly serviceable given they're mostly going to be used *as* musical earplugs (got Bose QC30, but ANC while not unpleasantly so is a bit white-noise-hissy plus the right silicone earpiece falls out if I move too much (nothing wrong with the tip, my right ear's just annoying like that) and oh yeah also MSRPs for ~250$ or something like that and the odds of me picking up a Very Good pair for ~90$ again are hahano <-< ). I'll have to stuff them in a pocket next time I go flying, I'm curious how well they'll stack up against the Bose... Doubt they'll win, mind you, but definitely curious how close they can come.
Disconcertingly light, but my other IEMs also involve nonzero amounts of metal (ZSN/C10/****) so in hindsight it's not really that surprising.