I've spent a lot of time with good balanced armature monitors stuck in my ears. Mostly it's a pleasure --- there are some darn good headphones out there of this type: Jerry Harvey Audio JH13, Shure SE530, Etymotic ER4P, and Audéo PFE come to mind. I've also spent a good bit of time with in-ear monitors that use dynamic drivers. That hasn't been nearly as pleasurable.
Lately, that's begun to change, and with the Sony MDR-EX600 and MDR-EX1000 I'm thinking we've got a real horse race on our hands.
The Sony MDR-EX600 ($199)…