i have heard one CUSTOM iem...
and im not overly impressed.
it sounded just like most BAs in the market today.
it sounded a BA.
i really dont get it why people in every part of the world crave for this technology.
maybe a good fit.
thats the only reason.
but if we talk about the sound.
it sounded just like BA.
what i mean is...to me, the fx700 is still better in dynamics, the weight of real bass, in naturalness of the sound and timbre.(something that BAs cant recreate).
i have an mx980.
and heard a custom. (UM 6 driver)
to me the mx980 is still a lot better.
-cheaper than a custom.
-easy to insert into your ear
-when i wear this, i hear a surround sound, sounds coming everywhere, in front of me...sides, under...
-the most beautiful highs ever...smooth and very addictive.
i have a ue700.
and although the HIGH drivers are good, airy and detailed, it is far from being excellent as the mx980's highs.
i would never doubt to purchase one of this earbud ever, if mine breaks.