The sound, fit, and function is perfect for DJing. Exceptionally tight bass that poo poos all over anything by Sony (700, V6/7506, 7509), Koss, or Ixos, and the mids and highs are nicely balanced. There's a slight (and I do mean slight) excess of bass, but it's in a way that lends itself to mixing and is never muddy and muffled. Etymotic's high end in-ear stuff obviously does better on the bass (as well as everywhere else) but that's a different beast. Unfortunately, the 1000's break. First thing to go is usually the slide joint. You'll notice they keep slipping on one side (left usually) and tightening the screw will eventually strip it. The solution is to superglue the sliders (open them up completely) then tape the outside with scotch tape, which is nearly invisible. A perfect solution, assuming you won't ever get to adjust the size again to anyone else's head. However, that's not the biggest problem. The plastic between the ball joint and the horseshoe shaped piece that contacts the driver housing will eventually crack and break completely. This usually occurs on the right side more, though by that time you'll see cracking on the left, too. It can happen out of nowhere one day and is catastrophic. For the price, this is totally unacceptable construction on Pioneer's part. They have been replacing them like gangbusters to people who have the problem, but you pay the shipping cost and there's no end to the number of headphones you'll go through. As far as I know, they haven't fixed it. Mine just went after only about 6 months. There are people on the Pioneer forum on their 5th one. They sound that good and work that well for DJing, but at this point I'm about ready to try the Senn 25. I've been to Numark hell and back about 11 times, and I don't want to start another cycle with a different product.