The ATH-M50 headphones are one of the most recommended headphones on the Internet. Sure they do sound quite good as for a 200$ headphone, but there are far better sounding headphones in the same price range. In my opinion coiled cable headphone version is more bulky than the straight cable version and adds an unnecessary weight. I have both versions of these headphones and I can say that the straight cable version is much much nicer.
 
Sound:
Bass: bass is overemphasised, muffled, loose I would rate it 6/10 and use EQ to bring it down a bit.
Midrange: the midrange is very nice when bass is EQ'd down, I would rate midrange 9.5/10.
Treble: treble has poor detail, quite harsh sounding, after 100 hour burn in it does improve. Overall I would rate it 6/10
 
comfortability:
 
Clamping pressure really makes it, impossible to listen to these headphones for long periods. Also the earpads warm ears up. I would rate comfortability 7/10
 
Conclusion:
Even though these headphones have problems with comfortability, bass, treble and non detachable cable I would really recommend these headphones for portable use and getting straight cable version, instead of coil cable, as it adds unnecessary weight. Overall I would rate these headphones 8/10

I'll make this really short (because of my poor writhing skills)
 
Bass - bass is good but I find sub-bass a bit lacking. 9.5/10
 
MIDS - Wow, incredible mids. But sometimes it feels that there is to much of mids. 11/10
 
Highs - really smooth and detailed and not as harsh as other headphones like DT990 or DT880. 10/10
 
Sound-stage - I find sound-stage to be lacking and probably not as quick as I expected when I first bought them. 8/10
 
Comfort - really great comfort, no issues except for the adjustment part. 9.5/10
 
Overall: I find these headphones to be amazing, but they are quite picky, and I find it hard to listen to mp3s.

Had a chance to test these headphones from a friend. Nothing good to say about these headphones, they sound horrible, like a plastic speaker. I myself owned beats solo HD which are really horrible sounding headphones.

Audio-Technica ATH-M50S are really great headphones for the price, but are definitely not the best cans out there. In my opinion these headphones have a lot flaws. Biggest flaw is the bass response. It's great for metal and hip hop, but even though I'm quite of a BASSHEAD, I find the bass to be too lossy, and really overpowering the mids and the highs, especially when listening to Pink Floyd . Sure if you are listening through a computer or a phone or any source that has an EQ it can be easily fixed by lowering the low frequencies. But there is one thing that I couldn't fix is the harsh, metallic treble. Even after 300 hours usage these cans still have treble problem which is unbearable when listening to "Drum and Bass".

Verdict:

Audio-Technica ATH-M50S has a lot of bass, which is great for hardcore bassheads, but lacks clarity in high frequencies, and despite that these cans doesn't have a detachable cable, Audio-Technica ATH-M50S are foldable, easy to drive, great for hip-hop, metal, rock, and has an incredible value, and boosting really good sound quality.