The sound quality is great, callers never complained in the area of call quality and I could always hear them. However, the design of the headset allows for interchangeable ear pieces. The design for these pieces is kind of weak.1. The differences in sizes between the earpieces is pretty substantial. The smallest one is difficult to get into my ear, and the next bigger one is probably 25% bigger.2. The ear piece does not insert all the way into the head set. This makes it flimsy and it ends up moving around quite a bit, and nine times out of ten it falls off the head set. I almost lost it a couple of times. When the headset is pressed against your head the ear piece is secure -- so this problem is limited to when you carry your headset in your pockets/bag.3. Because of the way the ear piece is attached it has never felt secure on my head. I always feel like it is about to fall off.tldr: headset is loud enough, microphone is clear, headset design results in uncomfortable wear and constant threat of loss.