I got my hands on a T.Bone IEM 75 system and naturally I was expecting the out of the box earphones to be... well, not quite suitable for the job. Truth is, the supplied earphones don't sound too bad, I'm using them now to "daily" activities such as ipod listening, but they keep dropping from their position with the slightest movement.
So, I found myself in need of a more suitable set of earphones for IEM purposes. After some digging around I noticed that the Shure SE215-CL had overall better comments so those were the ones I've got. The best thing about them is how good they fit into your ear, thus having a direct impact on how well they seal, maximizing low frequency delivery.
In terms of sound, I didn't find them to be amazing, just simply good. I haven't tried IEM-purpose earphones before, so I don't know if the spectrum of frequencies they deliver is supposed to facilitate specially the middle ones; if that's the case, they my bad, they do exactly as they're supposed to. If not, I would say the that the range of frequencies they deliver in practice feels a bit limited, as in "could be richer" rather than "sounds pretty bad".
The SE215-CL are very comfortable. The provided isolating sleeves work marvelously. The construction feels very professional, and the flexible cable allows for easy placement and performance.