Pros: soundstage, portablility, drivability, braided cables
my choice of music is mainly melodic metalcore and hardstyle, and hell was i ever attuned to the boomy kind of earphones (i was ready to put my wallet out for a pair of IE8s)
so far i got it only 3 weeks ago and upon taking it out, it sounded (IMO) lacking in bass and a little tinny. but within the 2nd week, it really did CLICK for me as mentioned by a fellow head fier - it sounds so downright immersive, with the studio like recording soundstage, as i you are jamming with the band; as if you could feel their presence. now when i have understood (or would people usually say, brain break in,) i loved my SM3s.
no more crying babies for it isolated like a champ, and only just musical nirvana every time i board the trains and buses.