These are the finest sounding headphones I've ever owned. I've owned Bose, Sennheiser, Audio Technica, Kilpsche and more and these new HD drivers DO sound noticeably cleaner then all. I know there are even better sounding headphones on the market but you'd literally have to spend double or even triple to top these. Also though they list for $260 you can totally find them for around $150-$200 if you shop around. Absolutely recommended.
 
Oh and by the way the MDR-7509 and the MDR-V900HD are the same specs the 900 is just the newer body style.