ermm... for those who are thinking of switching to ear-bud earphone. I would recommend the the brand "Ultimate Ears" I'm currently using UE Hi-5 Pro. It's a very great earphone with dual drivers (1 for bass and the other for high+mid range). Heard from the sales promoter that the earphone designer for UE is previously the designer for Shure. Check it out at http://www.ultimateears.com
Apple online is currently having a 15% discount on this brand. My model is selling @~$360. There are single driver models at lower prices and also those super $$$ high-end models (used by numerous artists and bands worldwide). In my opinion, the audio quality is as good, if not, better than shure.