Who gets to decide what overrated means? The people who have customs or the people who don't? Who gets to decide what too expensive means? The people who find spending $1000 + on one pair of iems or more to be no problem or the people for whom it's a struggle? All I'm saying that those terms are loaded, and the only true answers will lie with each individual's personal beliefs and circumstances.
For me, customs are not overrated. They give me what I like. I've had crappy, decent, and excellent universals, and have heard many others. None have recreated the sound quality I get from my UE11s. Do some come close? Probably, but close doesn't equal the that's it take I get when listening to my custom iems. Even loving them as I do, the mid bass bugs me just a little on certain tracks, and when I heard the universal JH13s at CanJam, I knew that I'd be getting the perfect set of iems for me in comfort, design, and sound quality. There's nothing overrated about that in my opinion.
Others may think I'm crazy. That's fine. They are probably right, but as my lifestyle allows this personal kind of craziness without detriment to myself or others, I'm hoping a-live-and-let-live tolerance might be extended, especially when it comes to posting here on this forum. I would never dream of deciding what overrated means for anyone, unless someone's talking out his bum, having zero experience with what he's insisting (not the same as asking) is overrated. I would never dare suggest when the laws of diminishing returns kick in for any member, since that's highly personal, but I do find it interesting that there is a tendency for people to want to apply their own personal limits to others and then start judging from that place. One size does not fit all. That's all I'm saying. Happy listening.
I am currently waiting for my ES3X. I'll let you know my more informed opinion once I get them.