As always, I can only relate my own experience - the disclaimer is right there in the first post. One ~$900 custom is not enough data points to make a generalization and I honestly don't see why the ES3X would sound significantly better than the UM3X in the first place - as TF10 owners are finding out, sticking the internals of a well-tuned universal (which the UM3X certainly is) into a custom shell probably is fairly limiting on the performance increase you can get, unless Westone seriously handicapped the UM3X. I also don't see how the driver argument is relevant - I've said countless times that more drivers does not equate to better sound in and of itself, and we see plenty of examples of that in the universal realm. It's what's done with those drivers that matters. What I do know is that Miracle makes the EX1000 - and any other universal I've heard so far - sound underwhelming - and that's not a statement I make lightly considering how much I like the EX1000.
Either way, unless you can point me to someone who has heard the UM Miracle and EX1000 and preferred the latter, I really don't see how other users preferring other customs to various universals is relevant. Even then I trust my own ears above anyone else's at this point, which is one of the reasons I do not read reviews or participate in discussion/appreciation threads. This would be especially true of someone whose views continually diverge from my own, as mine apparently do from yours.