I've had two other wireless headsets and gave up on both of them. Based on my sister's recommendation and the reviews I read here I decided to try the Plantronics 510. My other headsets were not loud enough and people on the line said they couldn't hear me. With this one, I don't even use the highest setting. In addition, when my sister has hers on, I can't tell the difference between when she is wearing the headset or talking on the phone. We also have talked with both of us on our headsets and it sounds great!