Pros: They can handle any genre thrown at them acceptably well. Also amazing for recording voice acting.
Cons: They are not the best at anything. They lack specialisation.
I originally bought these exclusively to catch more finite details with my voice acting and they did not disappoint at all. They handled the studio scene extremely well. They were very unforgiving to even the slightest falter in my voice. After I finished recording, I decided to try them out as just a regular fashion accessory pair of headphones. I got many comments from people. The design matches nearly every outfit I own very well. Also, the thick padding makes incredible ear warmers! But enough about useless blurbs. The audio is excellent for casual listening of random things on my phone. It handles the electronic pop sounds of Caramel Pop incredibly! However, the headphones make the more acoustic sounding bands, such as Tokyo Karan Koron, sound fabricated. I don't know how to exactly define it, but its like if the the music was a pencil drawing, someone grabbed a soft eraser and blurred it to the point of being Picasso. Other than its failure to convey the full acoustic experience, the M50 are excellent headphones. They aren't quite audiophile material, but for the general music listening community, they're one of the best all around 'phones one can get.