I bought the 559s however I find them new velour padding Sennheiser uses to be rather uncomfortable plus the left ear cup has been irritating the back of my ear. They sound decent, but sometimes sounds seem to melt together on certain songs which is sort of strange. I believe the 558s use a velour foam padding similiar to the HD600/650 and 598. I'm considering returning these 559s and getting the 598SE, 558 or possibly the 650. I just want something comfortable thats great for music, movies and definitely games plus a wide soundstage. I listen to mainly hip-hop/Rap, Rock, Indie, just a wide variety of things.