Well I've been using my Etymotic Research ER6i Isolator In-Ear Earphones for a few weeks now and I can report back with some longer term opinions. First off, as far as sound suppression goes, they work just as well as earplugs at keeping the wind and road noise out and as long as you don't have the music cranked, you'll hear what's going on around you just fine.

Now with regard to sound quality, it is absolutely top notch. Because outside sounds are essentially eliminated, you get clean, clear audio with crisp highs and nice deep lows. The earphones themselves fit comfortably into the ear canal and the rubber baffle piece slips off with ease for cleaning under warm water. And while inserting them into the ear is as easy and straightforward as inserting earplugs, a fairly obvious design flaw however, is that no provision is made for getting them back out, with specific warning to not remove them by pulling on the cord. Once inserted into the ear, they go in deep enough that you cannot realistically grab the body of the headphones to pull them out. I have discovered a little trick however, by using the end of my fingernail I grab the edge of the rubber plug and I'm able to extract the headphone with some downward motion. I did however read one user's solution, which was to make a loop from some fishing line to hook over the body of the plug, so they can be removed by simply pulling on the line, something which I will employ soon.

Otherwise they are relatively comfortable as long as they are not inadvertently inserted too deeply and they provide excellent sound. While somewhat expensive for headphones at $75, they prove their worth on the first ride.