I have been using these for about five to six months now, and have been extremely satisfied with the product. I use these at the studio, in my little bedroom set-up, at a dj gig and just to listen to music on a train or a bus. So basicly these are very versatile headphones and can satisfy a basic user, with no musical or studio kind of needs.
In studio use, i use these as reference and for some "closer listening" while mixing.
The sound is very clear. Low end is not overly boosted, nor is it non-existent, like in some headphones i have used.
They dont seem weak, and nothing has broken so far. I mainly used the M-Audio M-50 before these, and have had so many other ones (superlux, sonys,beyerdynamics, akg) and so far I find these to be my favourite headphones i have used.