I bought these to replace a pair of Pioneer HDJ-500 headphones which I mainly used for DJing and everyday music listening. The HDJ's were awesome in terms of sound, but broke in half after less than a year of normal use and hurt my ears if I wore them for too long. So for my next pair I decided I wanted something:
 
a) with good sound
b) comfortable to wear for long periods of time
c) durable
 
The M100's in my opinion nail all three of these pints, plus they look very nice. They also come with a very nice case that you can attach to your dj bag, making them very handy to carry around for gigs. Another plus is the cable which is wrapped with a kevlar enforced fabric making it very durable. 
 
I would deffinitely recommed these headphones for someone who is looking for a good pair that will last. The only thing I don't like using the m100's for is music production. I use a pair of KRK studio monitors during the day, but at night I sometimes resort to my heaphones. The overpowering bass makes mixing confusing with these, which is fair since they are not meant to be studio headphones. I just placed an order for AKG K240's to use with my DAW.  Ill let you guys know how they are.
 
Hope this helps, and if you have a chance please checkout some of our music
 
https://www.soundcloud.com/adaltadc
 
cheers
 
AdAlta