I use these every day for hours at a time. There isn't overpowering bass like with some powered model headphones (in line amp that uses a battery), but the quality of sound is 2nd to none in this price range. Every day I'm surprised at how good music sounds through them and I use these as a control when comparing production value of albums. I don't know how they would hold up to DJing abuse but I take care of my equipment and these have no issues (not to mention SK's lifetime warranty). The ear cups are made with some sort of soft memory-type foam that doesn't cause that hathead type pain that comes with iPod earbuds after 30 min of use. I've worn these for 4+ hours at a time and I forget I even have them on. I wouldn't recommend them if you're looking for headphones that block out sound and you're not going to get real noise cancellation unless you go with active/powered headphones. They dominate from hardcore to hiphop.