Phenomenal TRUTH cans!
I really don't need to say much in my review because I would be repeating what so many others have said. I'm the type of guy that prefers a flat and true sound. I enjoy hearing music exactly the way it was produced to sound like. My amp/DAC has a "Direct Mode" that when checked gives me the audio, mostly lossless FLAC or Monkey's Audio, in its purest form straight from the source. Any time I'm listening to music that mode is always enabled. I don't even use any EQ's at all.
I'm addicted to these and also my pair of HD 650's. I bought lighter and shorter oxygen free cables for both pair. The longer and heavier stock cables are in the boxes safe from harm. If you want a good quality case for the 600 or 650 check out the Geekria EJB-0034-01 case. They fit perfectly in that great looking case.
The only negative I have to add is that I regret not getting these sooner. I've known about them for many years. Many hours disappear quickly with these on my head but I suppose I'm trying to make up for the time I've lost not being able to enjoy them.
10 out of 10 stars!