That's the thing, for $300 something, getting the resolve of an ortho, no glaring flaws, nice looking, easy to drive, neutral, while blocking out external noise (closed) more than meets my expectations for a work headphone.
I didn't like the MSR much at all, personally. Now, if I wanted to lug an amp to work and didn't have to block out sound, the HD600 would be my choice as well.