I had high hopes for this but was let down hard. It sounded like I was inside a tin can. I tried it with the Noise Shield on and off but no difference. The caller on the other end didn't notice that effect but the removal of background noise for them was no better than my favorite, the Plantronics Voyager 510. The other big issue was the fit. The ear loop is slightly spring loaded to keep the mouthpiece sensor pressing against your cheek. This is intended to allow the sensor to differentiate between your voice and the background sounds. The problem was that the spring tension of the ear loop was slightly pushing the headset off my ear. It comes with several ear bud sizes and two ear loop sizes. I tried them all, on both ears. No luck. It was held on so loosely that the slightest lean of my head to that side and off it came. Completely unacceptable and far worse than all the others I've tried. I have tested 8 different headsets. The way I do my tests is to pair two headsets, put one in each ear, and then switch between them while on the same call. Even if I ignore the fit problem (a deal breaker for me) the sound quality was poor. Worse for me than the caller but why bother, I'll stick with my 510.