Thank you for your feed back. My main player will be the HTC One M7. Any reasons why not pick the E18 over E17?
I haven't tried the E18, so I could't tell you much about how it sounds. I don't think it offers all the bass and treble boost options of the E17 (Adjustable in 2db increments up to +10db or -10db)... I think the E18 just offers a single bass boost setting. For many people, I'm sure this is just fine. Perhaps it has an app on the phone that offers more control? I really don't know.