cheaper Sennheiser's have strong bass but lack some what in detail. but still give you outstanding sound over most brands.
the CX6 is not a cheap low end IEM earphone, for the price you get a secret gem. you get the same drive as used in the IE6 but with noise blocking.
don't leave a bad review just because you were silly and got fake headphone from market place or some too cheap to be true retailer.
don't leave a bad review if you couldn't read the manual and select the right tips.
the tip selection is good and is fine for most people, but im a sound freak and wanted the best for my money so i got some foam tips (you can buy them online) sound quality and noise isolation are really good and you get more then what you paid for. wide dynamic range with smooth very low extended bass.
I would like to add Sennheiser are a leader with over 60 years in the business they know what to do and how to do it well.