Okay, let's just say I enjoy my a lot and I am going to get the JDS O2 amp to get more soundstage and clarity becos I find that tad of warm more than enough for me even when using the ER4S.
It's all about personal preferences really. Anyways, I believe anyone with decent ears will recommend the ER4S because of it's quality but really don't expect too much for the bass.
So conclusion will be : Go ahead and buy the ER4S only if you have the money or maybe just try to audition it if possible. Auditioning is really the BEST choice. Try it out and you will be able to make your mind easily but if you can't get to audition it like me then I guess it's all up to you whether you want to or not.
#EDIT: I am no audiophile and by no means a pro in any of this. I just listen for the sake of fun :D
I am just a kid with some money to spare on audio.
Edited by MikuLover - 12/23/13 at 3:30am