My friend has the hs8 and i think they sound pretty good too, especially the midrange. Acoustic guitar sounded close to a real guitar instead of music from a speaker. At least that was my experience when I heard it.
I searched for the kh310 and when i saw the price i thought, yes, maybe in the next century… 
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That’s why I’m leaning toward the mk1 HEDD. I can get it much cheaper.
If money is deciding factor HEDD will good. Good reviews. Good quality.
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