The Plantronics is a Bluetooth device that is not a headset. It suspends from one ear and the receiver dips into the ear, similar to a hearing aid. Because it is Bluetooth, when one uses an iPhone, the hearing aid must be disconnected. The difference is remarkable. This has been mentioned on another forum as well. I have an online store and can hear my customers a lot better on the Plantronics. I don’t think it is poor adjustment by the audiologist. I was hoping that maybe the configuration of the Oticon would be different and more like the Plantronic. The ha works great in all other situations. It appears that the telecoil is used in large spaces.