The M50, V6/7506, etc. have something else going for them as well: efficiency and practicality. The average consumer isn't interested in a headphone that can't be easily powered by anything they plug it into, and they probably won't see the point of an open back design because it doesn't isolate. Truth be told, for portable or general purpose use, I tend to agree. Not to mention, the above listed headphones are quite durable. I've actually considered getting an M50x for tracking recently, since my SRH440 is on its last legs. I don't particularly care what the M50x sounds like for this purpose, since I'm more interested in the build and comfort, which I remember being quite good with the M50 I had years ago. What somebody needs to do is make a closed headphone that sounds like the HD 600, that's durable, comfortable and easy to drive; and which costs $200 or less and is widely available. Also, I'd like a pony with that, and maybe a unicorn as well (if not both in one!). That's exactly what happened to me. That and it was so much better than anything else I'd ever heard, I zeroed in on the detail aspect and the actual presence of a soundstage rather than on the balance, which, while initially impressive, eventually turned me off.