I had a pair of the Ety ER6i's a few years ago, but returned them after a week when comparing them side by side with Shure buds.
I much prefered the sound of Shures, which were better constructed IMO with heavier gauge wire and a far better seal at the ear, (with various size rubber and foam tips included)absolutely crucial for proper bass in an earbud.
The Shure E2's are fine but E3's and above are fantastic, at least to my ears, and I use mine a couple of hours a day during the week.
I'd also highly recommend
Earphone Solutions as a vendor.
Tim