I really like the size and feel of this earpiece. It's not 100% perfect, sometimes, I have to toggle through the different sound options to hear the caller clearly. For the most part the sound quality is okay. My first earpiece was manufactured by Plantronics and I hated the size and appearance, however, the sound quality was surprisingly better than the Sound ID SM100, and the Plantronics model I bought was cheaper. If I had to choose between the two it would be the Sound ID SM100, more so for the size and the styling, however, the sound options on the earpiece provided by Sound ID are pretty terrific.