Please give some constructive input as to the sound quality, and advantages of each unit. Which is the best of the two?

It's pretty simple for me. They are both used exclusively with my iPod. When I want glorious, smooth midrange, with slightly veiled highs and bass I can feel, I use the E888s. When I want details, details, and more details, I use the ER6s. For me, better recorded music has me listening to the Etys, while a lot of the stuff on the iPod (50s-60s rock & soul) needs some smoothing out via the E888s. Comfort-wise, I like the E888s. They fit perfectly and I forget they are there. The Etys are comfy, but I still know they're there. As with many of the things in this hobby, there is no "best"................only "different." Just my opinion, of course.

Your opinion is very good. I like the fact that you use the Ety's for good recordings. That tells me they add nothing to the original signal, that's why I ordered them. Thanks!