After wearing them for one hour, I had to take them off because of the pressure on my ears. I tried to bend the headband, but they still kept hurting my ears.
They have decent SQ for the price. The bass goes very low (30hz sine-wave hearable). Sound signature is slightly dark and they are lacking detail. I used to listen to bassy music (Dnb, Dubstep, Rap) on these, and they work well for that kind of music.
Summary: Edit (7/25/11): Came with a pleather carrying case which is nice. Great entry level DJ'ing headphones.
Uncomfortable to wear for a long period of time, after about an hour you'll start to feel discomfort from the pressure the headphones put on your ears. Stretching the headphones by putter them over something wide helps a lot, or just wearing them often to soften up the headband.
Pros: Superb lows, great mids and highs. Great for mixing.
Cons: Uncomfortable to wear for few hours with the stock pleather earpads.
Excerpt: The stereo plug bent the first time I used it. The phones no longer function. They sounded great for the first 5 minutes. I would not recommend these headphones if you actually use them. Leave them in the package. They look great. A Waste of [$].
Excerpt: I had been looking for a new set of cans for quite some time. Typically I tend to over-research a topic to death and arrive on one or two final solutions. This time I took a slightly different route. I consider myself an audiophile and love to pay attention to the clarity and little nuances in music. My last set of headphones (of this type) were Skullcandy Skullcrushers. Great for bass, and that's about it.
Excerpt: At the current street price the K81Dj provide an incredible combination of portability, durability, and isolation. They perform respectably in the sq area as well, providing a rich midrange, very strong bass, and accurate treble.A great set of phones that works extremely well at its price point (and makes me want to try the higher-end K181DJ).