How long have you had them? My fear is sweat and rain that have killed too many of my in-ear buds.
For about a year now. They're pretty durable. I use them at the gym too. And they come with a 2 year warranty so I'm not too worried about the near future.
I love the way they wrap around your ears and stay in place. The sound isolation is unparalleled and sound quality is as top notch as you'd expect from Shure.
The only downside is a slightly noisy cord but when the music is on you can't hear it at all.