When you are dropping $500 on a pair of heaphones, it's hard to get something bad. However, it's also very much about personal preference at that point. I've owned a lot of headphones, and I've been to a handful of meets. I've heard almost all of the top-tier contenders. The K701 is probably one of my least favorite. It's not bad... but I found it to be very lifeless. The W5000 is another top tier headphone that I did not at all care for. I want my headphones to be exciting to listen to, and these just weren't it. Grado's are easily my favorite headphones but as I pointed out earlier, not even a consideration for gaming. Over the years I've put a D2000, HD600, A700, AD900, DT770, and a K201 through my personal setup for gaming. The D2000 was the clear victor for me, and I've since parted ways with the rest of them.
Short version: If you're dropping a few Benjamin's on headphones, it's a wise idea to try them out before you buy. Everyones taste varies; you aren't guaranteed to love something just because someone else does.
Couldn't agree more.