As with any in-ear ear-phone you must have the correct fitting on the ear piece to ensure they fit snug in your ear canal. I suspect people leaving the negative feedback have not done this! These headphones deliver high quality sound and excellent bass. These are just as good as Bose - my advise is save your money and buy these. I've had my CX200 ii for 2 months and have no problems as other reviewers and are very sturdy and robust - well they have survived being in the hands of my 20 month old son!. Do your self a favour, get these and you won't be disappointed. if You do think they poor, then they're probably fake! Happy Dayz
I bought these about six weeks ago to go with a Philips MP3 player I bought. The sound through these is great - and they block out background noise really well. Pick the right size fitting and they fit nicely such that they don't fall out of my ears at the gym.
The way that they sit inside the ears means you hear certain noise (like your jaw when chewing!) up through your ear - so it takes a bit of getting used to. I can understand why some people don't like this. But after a couple of uses I got used to that so I don't even notice - all I hear now is crisp sound with minimal background noise.
And - I was pleased that they work as an FM receiver (replacing the default headphones) for both the Philips MP3 player and my Nokia N95.