Summary: Before I bought these earphones I seemed to go through loads. This was mostly due to the way the mp3 player sat in my pocket. I solved with buying an mp3 player that clips on instead. However, I did end up having the same problem eventually (though they lasted a little longer. I have tried every earphone from the very cheap pound store ones (I was a student) to the still quite cheap ones but not as. The most I'd spend would be around £10.
Pros: good sound quality, comfortable to wear, anti-tangling