Summary: (Original review is after the "====" row.) I've been using this a lot for the past fortnight, and getting complaints from the people I was talking to. So, I did some tests, calling my answer-phone, with this and two other (Jabra BT3030, a Moor Wireless Stereo Bluetooth Headset) Bluetooth headsets. Playing those back, the "sent" audio from the Sennheiser is truly rubbish. The noise cancelling that they bleat on about so much cancels noise such as "the speaker's voice".