I have purchased both the Smoke HS850 and the Black HS850. The smoke version had an echo giving the effect of being down a hallway, with pops on high pitched sounds. I expected the black version to be similar. The price difference and ability to prevent hitting the button by closing the headset made it worth the sound issues. When this product arrived I was amazed to see that it was nothing like it's smoke-colored version. The clarity was great on both ends, with no pops or echos. This is not the US version, as shown by the included european adapters, but it definately should be. The bass does become a bit jumbled at full volume, but not enough to make the conversation unclear.