Welcome back. My quest into audiophile world begun with ER4S. Thinking that if this fairly inexpensive unit can offer such detail how would headphones and IEMs many times its price would sound like. I have never bought any custom IEM but recently I purchased an IEM with a retail price of 799 AUD and simply put ER4S is able to compete with that in almost all levels! I dont think ER4S will ever die.
They are so good that a company in japan has made a more efficent version of them, the fit ear go 111. Have a read about it, you might like it. I am saving for that at the moment. I have realized that the sound signature I enjoy is what i hear from ER4S and I can safely say my search is over.