Re: Removable stem seems like a reasonable suggestion...
At $250, what *other* $250 earphones was he trying? I mean, they have been sold and around for decades, but I seriously doubt this is not a comparison on a free $1 set and a $250 set!
TBH, most of the 'expensive' stuff has been for badging (like the garbage with the 'dre' name attached), nothing at all for the quality. I've got a $30 set of Philips over-ear phones that are superior by far to most other stuff out there, especially to stuff over $200. I've got quite decent $5 ear buds as well which out perform the few more expensive ones I've tried.
It's like the Denon cables or whoever makes the $10,000 patch cables, marketing to stupid people too embarrassed to admit they were had. Probably the only decent premium phones ever made were the "Motorhead Bomber" ones, but I've not been fortunate enough to get my hands on some for a good testing.