I did a lot of research before plumping for the CX300's and I have not been disappointed with my choice. The sound quality is excellent both at the high and low ends, and I have not heard such a deep bass from such tiny headphones before in my life. You need to push the CX300's to almost painful listening limits to get any audible distortion from them and on the whole they reproduce a good quality sound. I have found that you need to use a bit of trial and error get them sealed in your ears into the best position for a quality sound. They need a little twisting and turning for you to get that deep bass in all its glory. One gripe that I have is the cord entry position. It may just be the odd shape of my ears that are the problem, but I have found that it would be better if the cord entered from the end rather from the side. These headphones need to be pushed well into your ear canal and the side cord entry can restrict that a little.
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Advantages: Excellent sound quality, comfort and value for money Disadvantages: Some people may think they are overpriced for earphones but they are well worth it.