At first I wrote a real negative review about these but I have just realized I was wrong. I changed the size of the bud that goes in the ear to where it was a rather tight fit - and - problem solved. My opinion of these went from a 1 start out of 5 to a 5 out 5.To get the awesome sound that these ear buds offer you MUST have the right size bud in your ears.If there is any wiggle room for the buds when in your ear you will get terrible sound. I have a feeling this is where many of the negative posts have come from. I am telling you, once you get the ear buds nice and tight in your ear, you will get the high quality sound that the Sennheiser name is known for.