You may have read this one before: They sound fantastic, they look fantastic and they sit just right on your head. All of that is true.
Unfortunately, the build quality of all the materials that surround the drivers and padding is utter garbage. I've had a pair of K-602s before and I was struggling with a breaking solder for 2 years. I sent the cans to Harman, they fixed them, they broke again and so the cycle continued. After the warranty was gone, I had to try and fix them myself. Incidentally, they don't open very nicely, and it's really easy to damage the plastic parts.
When I received the K-702, I had to take one look to realize that they're built the exact same way, except that you can take the cable off. I've also seen many people writing that they've been having troubles with the solder breaking, so I will return these and stick to my Beyerdynamics.
Again, these headphones sound super crisp and are some of my favorites in terms of sound. Just pray that someone put a little extra soldering on your pair :)