Nice impressions. That rounded affect you mentioned reminds me of how I felt about the PS-1. It helped on badly recorded music, but it did add a colored element to it.
I think I might just have to buy a pair of etys. I like the Shure E500 and the slight improvement without giving me the Ety highs may not be worth it. I'm sure I will go back and forth for awhile. I want 1 IEM (not spending over $1000 though) that does everything well, but it seems the Ety's still own the extended high frequencies which are really needed for voilins to sound strong.