Based on the noise cancellation claims and reviews I couldn't wait to get this headset regardless of the relatively high price. Once I got it I immediately went to work testing the key feature. So far it was such a big miss compared to the claims that I actually wondered if my unit was defective. Interestingly while there are troubleshooting steps available from the manufacturer on pairing (where I had no problems) there isn't any mention on their site or in the guide about troubleshooting the "Noise Shield". So I contacted their only available contact point (email web form) and got a notice that I would be contacted within a couple days. This proved to also be a case of Aliph over promising.So what were the actual results of testing the "Noise Shield". I was able to discern a noticeable reduction in the volume of music (various) and talking (BBC/NPR news announcers) in the background and does improve the ability to hear the person talking. However, unlike their demos the reduced volume background noise clearly came through. I could tell what songs were playing, understand lyrics, understand what news announcers were saying, etc. Against steady noise like a shower it seemed to perform much better with complete elimination after some seconds adjusting to the sound.SummaryPros-It does improve the ability to hear the user amongst background noise.Cons-Expensive compared to similar products.-Does not eliminate sound anywhere close to what the company claims.-Incoming sound is a bit weak and can be hard to hear in noisy environments (the target market?).-Support / warranty are terrible.Neutral-The fit was tricky at first for me so I see what people are talking about with this complaint. However, after some time and experimentation I eventually figured out a combination that seemed to get an "ok" fit.