I bought the Plantronics CS70 headset system at the recommendation of my Hosted VoIP provider. The headset is connected to a Polycom IP450 in my home office. This is my primary work location. I use it every day.The call quality is excellent; and it is a very comfortable headset (I forget I have it on sometimes).I am disappointed with the limited range - I cannot go from one of the house to the other; or outside.I have not been able to get the HL10 lefter accessory to work correctly with the Polycom IP450.