I use it with Avaya, built into the computer. As a result I've only been using it with the dongle, instead of risking it trying to connect it via Bluetooth. Let me simply say, the connection has been flawless. No instability on any call. No delays. Voice, both me speaking and hearing others, is clear, loud, and overall exceptional. So far this has been a fantastic purchase. The construction of the unit is pretty solid. Some metal and mostly plastic. Fits magnificently with very little slippage once placed on my head. Snug, yet comfortable. The boom mic mutes when I move it in the upward position. All buttons work perfectly. I don't wear the thing non-stop straight with non-stop calls. I cannot attest to battery life, but it seems solid. For just short of $110, I am astounded as to the quality. I imagine you will be too.