I recently purchased the ER-4P from Amazon and they go back on Mon or Tuyesday. I listened to it only long enough (1 hr) to know it is not for me. Maybe the high detail is there, but I haven't paid enough attention/time with them. The bass is definately low. I don't consider myself a basshead but I obviously like some.
My first impression was that they were nothing special. And both the foamy and triple flange bothered me. This might be true for any IEM, so it may not be a knock on the ER-4P specifically. I cannot comment on the cable microphonics compared to the past, but the cable is still microphonic. Ever time I turned my head the movement was heeard through the HP. Not bad when music is playing, but annoying inbetween cuts, and when music not playing.
If you are planning to use them in an amped situation (either at home or with a portable amp) and especailly if you want the best frequency response for mixing, you would do well to get the 4S variant or the cable that changes the P to an S (and can be switched back and forth). If like me you purchase the P alone, then the cable to switch impedances to get it to be an S costs about $50. So if you can find this as a P/S right off the bat it may save you some money. The downside (that I've been able to gather) is that the impedance change means it plays quieter so it may be inappropriate out of an iPod unamped.
Bottom line for me was I could tell because of the low bass thesee HP would never bne anything special for me. This was simply my gut decision based upon personal preference.
I hope that this helps in some way.
Laurence