Originally Posted by
murielales
I have owned two pair of excellent custom headphones, which I purchased for their sound quality (Ultimate Ears UE11 and Jerry Harvey Audio JH13s), and currently have a third on the way (Jerry Harvey Audio 3A/JH16: which is more of a system than a headphone). Prior to this, I owned Etymotic ER4Ps.
First, I am proud to say: "Welcome to flyertalk." So many of the first posts on this site are questions, not answers; such a well considered post is really appreciated and sets you apart. I can see that you're in the major leagues (your UE 11s retail for $1,150) and I'm still playing TeeBall (my Shures were about 10% of that).
Anyway, the consensus I'm seeing here is: select the gear first, get the best fit possible, insert them carefully, and decide if the custom fits are really necessary. And it sounds like a bit more homework on my part is in order.