I just got a pair of ER6's right before going away on a trip last week. Didn't have much time for burn in or practice inserting. But, I wanted to try out my new purchase ASAP so I brought them with me. Also brought along Sony 888s for comparison.
Initial reaction: Although I thought I initially had a good seal, turns out I did not. The sound was OK, but the 888s sounded, well, THERE while the Ety's were OK but not quite as present as I would have expected. The word anemic kept coming into my mind. This feeling persisted while travelling. Tried several different ways of inserting the tips, at times thinking I was there, but never really getting it.
Being sort of bummed about NOT getting the sound that I expected, I decided to stick with the Ety's because of the isolation while in flight. And an amazing thing happened. While on the way home, I finally got a good seal. Think this moment also seemed to coincide with an adequate amount of time "burning in". Suddenly, the sound emerged properly! Always cool experiencing an accoustic epiphany. Anyway, once I discovered how they should feel and sound when properly inserted, life is much GOODER.
Getting them sealed properly is now MUCH easier. And the sound is lovely. Not only was there excellent and neutral sound, I was able to hear detail with the Ety's that just wasn't there with the 888s. The folks sitting next to me were treated to quite a show as I flipped through CDs to try other music to see how it sounded, all the while with a big, silly, grin on my face (the feeling persisted while listening to Bob Marley, Pearl Jam, Keb Mo', Allman Bros, Rush, Dave Matthews, Elton John, etc. Bob Marley's, "Redemption Song" produced goosebumps!). And the truly wonderful thing was, I couldn't hear any comments from them! There was excellent isolation... the only time I heard the screaming 4 month old behind me was when I took out the phones. Makes sense to keep them in all the time.
NOTE: The Ety's have a totally different sound than the 888s. The 888 seem very colored and, sort of like the sound is being pushed while the Ety's seem much more neutral and balanced. Very, very nice!
But, after experiencing these phones, I'm definately going for the ER4P. Time to end upgraditis.
Give it some time. Might work out for ya!
Bruce