Pros: Stays in ear, even when walking. A little static until I figured out rotating gel piece in the ear until static stopped improved sound quality. People I called said sound was very clear & much better than my Motorola H17. The case is a great feature.
Cons: Hard to install the gel piece on the headset. Minor complaint, since I don't need to change it once I found the right size. Would like a hook option to reduce risk of it coming off ear.
Summary: Returned the Motorola H17 due to complaints from people I called, even though on my end it sounded great. Once I used the Plantronics, no more complaints!