use comply foams. i've tried both olives and comply, and nothing beats the comply stuff. expensive, but it's the nature of this "hobby".
Seriously what is the big deal here? When you buy the ER-4PT Etymotic will give you a piece of paper with YOUR IEM FR data on it, both L and R channels, and a serial code, if you them look at your IEM the L and R earpiece will have the SAME serial code as on the piece of paper Etymotic provided, as proof that the FR data you are receiving is of YOUR inidividual IEM.
It's not just a massively photocopied piece of paper with a signature on it.
Etymotic is offering you something no other IEM company will, unless you venture into customs at much higher prices, if you don't like the FR graph of your IEM when you receive it (in the off chance the L and R channels aren't matched and the engineer was drunk when signing the paper) then you can send it back and ask for a new one.
I'm impressed by the FR chart, accessories, packaging, cable etc. of the ER-4PT, but I'm having a hard time with the fit and the sound (SO FAR), I'm going to keep trying.
Here is my post from a different thread:
Ya... I got a better fit... they sounded pretty good for a while until the Etyrāpic EarRape-4PeneTration blocked my right ear so I can't listen to anything right now.
They sound analytical, maybe if I was a cyborg with dual-mono input processor jacks on my head I'd appreciate them, the analysis is overrated though, I've heard higher detail retrieval elsewhere, unless you have to place the "syringe" of sound exactly 4mm away from each eardrum and I'm missing something, will try Shure Olive tips later, sigh.