The star rating is meant to be an overall score on sound quality, comfort, design, and overall value. I say this because I have tried the denon d600s and wondered why they fit perfectly on my head on the smallest headband adjustment setting, but felt sound quality was very good and design was pretty good. Value was pretty good, so I would have given the d600s four stars overall. Just an example on revision the score more accurately.

when a company makes such a horrible design flaw like the headband... that one flaw ruins the whole headphone. it is a major flaw. it doesnt even deserve 1 star. also, this headphone requires very extensive burn in time. minimum 400 hours. that's ridiculous! those drivers need to be burned in at the factory. very poor design by Denon!