The S4i has an inline mic that works well with Audioboo and the cables don't seem to generate the same kind of rustling noise as I get with other earbuds. You might expect the 3.5mm plug on the unit to work with everything but it won't work for my Sony Ericsson Xperia Arc and only the earbuds work when the S4i jacks into my Nokia Lumia 800 or my laptop. You can't expect all pieces of technology to be interchangeable and there are some clever mic technology circuits embedded to the voice part of the S4i that don't work the same in other configurations. When used with iOS devices, the in-line microphone seems to reduce mechanical background noises and wind buffet. At least that's what I've noticed when making Audioboos with the Klipsch S4i. And Johnny Cash sounds just fine through the earbuds.
Amazon -- Klipsch S4i reference earbuds