This is my second headset replacing the Motorola one that came with my cell phone.  People I call tell me that the sound is very clear on their end and cannot tell that I am using the headset - sounds just like I am talking into the phone.  That was not the case with the first one. I travel a lot and wear the headset for long periods.  My ear does not get tired or sore from having it on.  The headset seems well balanced and never seems like it is going to fall off regardless of what I am doing.  I also like that it folds flat for easy carrying in my shirt pocket.