Vital to fit the right flange,
This review is from: Sennheiser CX 500 - High Quality Noise Isolating Ear-Canal Headphones With Volume Control - Black (Electronics)
I recieved these and initially felt they were lacking any bass. I tried the medium flange, medium double flange, large double flange, I just couldn't get the right size with a nice fit and good bass.
Then I tried the large single flange, which fitted me absolutely perfectly, and the rich bass came flooding into my ear canals. Be patient with initial fitting and then soke up the awesome sound of these brilliant earbuds.
They are also verging on crisp on treble and midrange I found, but not so they are too harsh, and they help to bring out every instrument and vocal.
At around £15 if you shop around, they are extremely high quality phones,so if you wanna save money, forget the Shure etc. and get value for money AND top quality sounds.
I agree with the thing about packaging, but its not big deal really.
I've also heard that Sennheiser take a while to settle in, so they must surely be outstanding in a couple of weeks time.