Me three! They were great right from the get go, but they improved subtly as time went on. I find no muddiness anywhere in their spectrum. I have been hearing these from many fine people here, so I have been looking, but to no avail. For me the NH's are the pinnacle of headphones and my Shure 1840's which are no slouches, complement their new cousins the Nighthawks.
I have just finished listening to the Berlin Philharmonic play Berg's Violin Concerto and the Shoshtakovitch 8th Symphony and I am still mopping up the tears I shed over the beauty of these and the wonderful reproduction by Skylar's babies! I am in love!
Leo
They are definitely incredible with classical music.