Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Marginal at best

This thing has two pretty major flaws. First, it only cancels some noises, but it seems to amplify wind noise. Second, the charging method is poorly designed. Not only does it take a special charge adapter (vs. the mini-USB plug used by most devices), the charge adaptor actually broke the housing about the fourth time I used it. So now I have an expensive device that is glued back together and doesn't perform to my expectations. I actually prefer the bottom end Motorola blue-tooth device that came in the package deal with my phone.