GilesGuthrieA UK hi-fi magazine recently slated them, in a way which makes me think that they weren't actually wearing them properly. They said that the 'phones were tinny, and lacking bass, which is symptomatic of not having them far enough into your ear. They recommend the Sennheiser PXT-100s
I just bought a pair of Shure E2c's as a replacement. Much, much better in both build and sound quality. They're expensive, but I got them pretty cheaply.GilesGuthrieI use the EX71s. They're very very good, but as GTRacer4 says, they do have a finite lifespan. I am on my second pair, the first lost a phone after about 18 months.
GTRacer4They'll begin to sound better once you've 'burned them in'.
Don't eat anything crunchy with them in though. It hurts.