Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Nice, but a little quirky at first

Generally, it's a great product. The call quality is very good on both ends of the conversation. I've had only minor concerns such as: getting the device on my ear quickly (it takes getting used to); I wish it could be used while it's charging. But, I'd highly recommend it despite these minor issues. It has a good range with my phone (an older Nokia 6255i).