I tried the Sennheiser with the stereo controls for one month. I liked the noise-cnx and I liked doing the "rubber-band" thing, but, I decided the whole thing was not worth the hassle. I usually had an earcup off to listen to whispering Captains, too many wires to plug-in and plug-out(rubber jungle), batteries are a hassle, and the fatique issue seems like a sales-gimmick to me. Sennheiser happily took it back and I am happily using my molded ear-piece thingy again. Keep it simple, man.