I've had the Beyerdynamic Custom One Pro for about a year now, and it's been an up and down experience.
I decided to buy it after my old DT 770 PRO broke, and I read on various internet forums that COP was similar to DT 770, only with stronger bass. The stronger bass part is certainly correct, but it's just too sloppy for my taste. The bass sounds bloated and imprecise, and the mids and highs leave a lot to be desired, especially compared to the much more open and precise DT 770s.
I generally listen to dubstep (the original, sub bass-oriented type), Trap (again sub bass-oriented) and Neurofunk Drum & Bass.
Now what I'm looking for is a pair of headphones for about 250-350$ that provide stronger bass than DT 770, but overall a more precise sound than COP.
I'm not well versed in audio terminology, so if something's wrong/off feel free to correct me.