Different phones for different music and moods...generally though, I LOVE my HD650's for almost everything. Are they perfect? No. Is there anything fundamentally "wrong" with them? No. They may be great for say, Stevie Ray Vaughn, but if I suddenly change my mood, and go techno or death metal, I tend to move over to the Denons. Sometimes I like the Senns better, sometimes the Denons. I constantly waffle between which I like more, but am I happy with both? Yes. Unless I finally get a set of HE90's and upgrade everything there is to upgrade (and I mean every single resistor, capacitor, bit of wire, EVERYTHING), I don't think I'll ever be fully satisfied, but I'm at the point where I love the way my system sounds, and dont think I need to do anything to it for a loooooong time.