I love this headset!  I forward my office line to my cell phone (blackberry) when I leave. People are surprised when I tell them that I am on my cell phone. They say it sounds like I am on my landline in my office.  The fit is fabulous as is the sound!  I purchased this headset after I purchased the jawbone.  I returned the jawbone because it was to frustrating trying to figure out how to get it to stay on my ear. I didn't think I would find another headset with such clarity in the sound as the jawbone.  I did!  The Blueant Z9 sound is just as good as the jawbone.  I highly recommend this headset!