The only thing that's stopped me from getting one really is the availability of 3.5mm TRRS plugs to reterminate my IEMs more than the internal memory, since I can live with a fixed 32gb for mobile use. It's not like a tablet or smartphone where that 32gb would need to be shared with apps and other sorts of files, like photos or PDFs.
If your IEM already has a replaceable cable design (MMXC, Westone / UE two pins, etc), HifiMan is actually selling some balanced cable bundle that can instantly turn those IEM to balanced.