I'm lost. So M50s are good? Or are you recommending I just stick with my CX300 earbuds?

Thanks for the response. Why would I be trolling? I'd be trolling if I was lauding how awesome they are lol.   Um, as for sound quality, I like crisp, clear sound, not TOO treble-y, and not extremely bassy either. The only reason I looked into the QC15 and the beats is because I fly a lot...

As title. What should I get instead? I want the pinnacle of audio quality and build quality, and any noise cancellation would be great, since I fly a lot.