Oh man, I'm listening to Grados for the first time, and I don't see why people say that 595s are not good for rock!!!! The 595s have the bass and highs. I guess some people just don't like any soundstage. To me, the 595s have perfect range: both in soundstage and tonality.
Im listening my new (actually it has about 50 hours of burn-in) HD595, and i can STILL see errr hear very well why its not ideal for hard rock. Distorted guitars have noticeable "veil" like in highs overall, like some notes of its overdrive vibration is smoothened, and cymbals are unrealistically softened. (cymbals ARE incredibly sibilant instruments! In real life, it does "punches needles" thru ears with strong ssssshhhh)
But classical and ambient... MUCH better than my SR-225 and AKG K240S. I love it. Overall sound is unrealistic for what instruments really sound like, but its still excellent!