I heard the same thing when switching from ES3X to $79 RE0. Maybe my ES3X was defective of course, although I doubt it because all the drivers were working - I could hear the sub bass, mids and upper treble fine in both sides. The issue was that the sound was muddy, incoherent, compressed with bass that had no impact and treble that was quite muffled/recessed. Even if all of these issues were fixed, ES3X still cannot match RE0 in the treble and it just doesn't sound very dynamic or detailed. And the soundstage, like you said, is not very impressive. I felt like I was ripped off. Thus, I am now highly sceptical about the sound of expensive customs. Of course, the ES3X may have been an exception and I would love the Miracle if I got one, but something tells me that putting extra 3 drivers per side is not a good way to improve sound quality, especially considering that I find even good 2 driver IEMs already a bit incoherent. All 3 driver IEMs I tried are usually less coherent than the 2 driver ones to the point where I can't stand them. I haven't heard IEMs with more than 3 drivers. I read somewhere that more drivers can actually make the sound more coherent, but I don't see how that's possible. Say a 2 driver IEM won't sound as coherent as a well designed 6 driver IEM, but that sounds like bollocks to me. You seem pretty knowledgeable in this area, so maybe you can shed some light on this phenomenon?