Got mine yesterday, i must say they are a well built.
My home phones are HD650 and i think the M-100 are a good pair to use on the go.
They lack a little bit in the mids but not as much as some may say.
I Mainly listen to Rap/Hip-Hop and i can't say i miss much, but when i put on some Bon Iver or Mumford and Sons i miss a little warmth.
But for a portable headphone i must say it's a catch, and well produced clean hiphop records has never sounded better, say what you will about Beats, but Dre can produce clean records.