I used to have Etymotic er4p's, and unfortunately left them on an airplane never to be recovered. I now have the Shure e3's. In comparing the two, I like the Shures, but not quite as much as the Etymotics, which I just loved. I think the Etymotics sound clearer with better bass, and they fit in my ears better because of the three-flanged earpieces. The Ety's are probably worth the extra money. That said, both of these are great earphones and perfect for airline travel.