Pros: price, maybe volume control
I got these for cheap and they were my first pair that I didn't buy randomly. I read a review in which they were praised as a great IEM, even for the launch price of $ 150. Turns out Sennheiser bribed the magazine (there's no other way)!
Comfort is okay, the cable feels good but is highly microphonic. Even wearing the CX-500 over-ear doesn't help enough.
Audio quality is all muddy bass. There's nothing to it. A warm sound, exaggerated bass, colored mids, bad highs ("Tsh" instead of a "Tz" sound with hi-hats), poor resolution (everything is smoothed out), no soundstage.
That's it. The CX-500 in a nutshell. Avoid if possible. (This review is based on the € 30 I paid new for it. If I had paid anything above € 50 I'd hate myself! And yes, I'm 100% sure I don't have a fake. I got it from an official reseller in a store.)
BTW, the only difference of the "G4ME" edition is the even more ugly plastic chrome look. Why they charge even more money for the uglier "G4ME" version is something I'll never understand.
Just, simply don't... they give Sennheiser a bad name (and for me enough reason not to trust this brand again)!