Summary: I believe the Bowers & Wilkins C5 are the best ear phones for under $200.00 available today. Sound quality is superb. They have a wide dynamic range and provide a full sound experience with all music types. I have tried many ear phones and the Bowers & Wilkins C5 are the best single driver ear phones I have heard. Another great aspect of these ear phones is the strength of the cable.
Pros: Great sound quality. very comfortable to wear
Summary: They're good, not great. Once they are seated in your ear the right way, the noise cancellation and sound quality are outstanding. The down side to them is that they slip out fairly easily, and any change in position changes the sound quality almost instantly. They're not the greatest for exercising, either, because any change in your head position from upright makes them shift in your ear.
Pros: Great sound quality. Allows use of your phone unlike other noise-cancelling ear buds.
Cons: Sound quality is very dependent on position, and getting them to stay put is too tricky and unreliable.