I've had mine for years and I've had absolutely no want or need to get something to replace them. I use them primarily in bed at night, when mowing, and when traveling (plane ride, hotel, etc.).
They have a very small soundstage as the sound is pushed right into your head. That being said, I don't find that to be a problem at all and have many moments where I'm completely engrossed in the music and don't even realize they're still there. Some recordings have more queues for placement and it's not hard to feel like the room is huge with them if the recording is like that. I've listened to E2Cs, E4Cs, and TripleFi 10pros. The soundstage is about the same to me.
They're amazingly detailed. You can hear everything in the recording (to faults I might add). I find the bass to be full and accurate, the midrange is a little flat (compared to my Grados), and the highs seem wonderful to me. They're all about accuracy and it shows. They don't have the "exciting" elements like the Grados have, but they are more than capable of being fun with every type of music I've ever thrown at them. They do excel at female vocals, IMHO.
The isolation is top knotch. I've started using the new "glider" tips exclusively and they work great. Can't hear anything around me.