For years I've used a set of ER6 earphones from Etymotic, and overall been reasonably satisfied.
On the negative side it's very hard to get a good enough fit to get decent bass from the earphones.
On the positive side the mechanical noise reduction (by getting them inserted properly into the ear) is fantastic, your fellow passengers on the train or plane can't hear what you are listening too - nor are you disturbed by them.
So this time around I went for the new Etymotic HF2 - with a twist, as I now have the option to get a set of custom earbuds made in Guildford (!) to get a perfect fit. But the earbuds cost the same as the HF2's - turning them into a set of very expensive earphones indeed.
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