This is the third BlueTooth earphone I have purchased. My first was the Motorola HS820 and the second Plantronics M2500. I want to briefly go over these because without my knowledge of these two earphones, I would not fully appreciate the quality and superior performance of my Logitech earphone.Motorola seemed to have a fairly good microphone, but even set at maximum volume, I could not hear if there was even minimal background noise. Additionally, even on a calm, windless day, I would have a problem with wind interference on the microphone just by walking and moving through the air. It also took about 7 seconds to make the connection with my phone after I answered the call and I sometimes got complaints that my voice would cut in and out while I was talking. Also, the Motorola light flashed too frequently, was too bright and was annoying to those around me, especially in lower light situations. In some situations, I could even see the flashing myself while I was wearing it.I went to Plantronics next because they are a name I have grown to trust from working with their products in the business world. The speaker/sound quality was MUCH better as the ear-bud gently fits in the ear and blocks a bit of the background noise in that ear. The microphone, however, was of poor quality; People complained of rarely being able to hear me clearly and loudly and again I had the same problem with wind creating interference with the mic, just by walking through calm air. I would have returned this had it not fallen out of my pocket on an airplane. I only had this model for about two weeks so that's all I have to say about this one.I purchased the Logitech on sale, the least expensive (though not by much) of the three and it is by far the best! I am able to hear the person on the other end of the phone even with moderate background noise. People tell me they can hear me clearly and the sound quality of my voice is even better than when I use my phone without an earphone. Even during really, heavy, Santa Ana winds, there was no wind interference. I have seen a couple product reviews stating that one disadvantage is the foam tip (just a note, this is a hard, durable, type foam, not a soft foam rubber) reduces voice quality but I have not found this to be the case at all. The ONLY detractor I have noticed, and it is a small one, is the multifunction button has a light that comes on when you hold the button down long enough to turn it on, off, etc. Well, while you are holding the button, you can't see the light. Now I simply put the earphone on my ear when I turn it on or off because there is an audio cue to let you know the earphone's operation status as well as the light: Problem solved. The function button light is also smaller and less bright than my Motorola earphone (I can't recall the light on the Plantronics model, though I know it had one) which is a good thing because it's less annoying to those around me.