I have Etymotics, the same model you ordered. It takes a few days for your ears to adjust. They'll irritate and annoy you for the first few days but bear with it. Be sure to read the instructions first! And don't pull them out of your ears very quickly, they have quite a strong seal! With them on, you might as well be deaf to the world, they're that isolated. I have 5 pairs of different headphones, and the Etymotics are the best of the bunch.

Be sure to have a good headphone amplifier. I tried them on a portal CD player, and they're better than regular headphones, but weak. I think earphones like these deserve a nicely matched amp.

Calvin