I got my headphone from bay bloor radio in toronto. They are very light and comfortable.I think they are extremely balanced , warm with a very rich and detailed sound reproduction. I didn't want to take them off my head. They were very light on the noggin and so comfortable. One could easily wear these for a very long listening session without any discomfort.

while I didn't find these horrible, they aren't too impressive either...
a little congested, too much warmth from bass bleed etc etc.
upper mids lacking too much for my tastes.

however worth mentioning is positioning for these are very important.
just moving them a little too much to the back of your head will change the sound a lot. clarity and such while not great in any position is greatly improved when you find the right spot.

Wow, that is some fat bass!

I'm glad a second source isn't showing a 15dB dip at 1kHz. People kept using a couple of horrible graphs as ammunition.

I wouldn't say the Denon AH-D600 sounds even remotely similar to the Nighthawk (I've owned both).

The Denon has less upper bass (they did a good thing dropping at 25Hz). It also dips at the heart of the mids, and the Nighthawk doesn't.

If the AH-D600 didn't dip there in the mids, I would have really liked them, to be honest. With the Nighthawk, if they didn't bloat in the upper bass, I would like them a lot more.

If you were to combine these two headphones and make them fit on my giant ears, I'd love them. The closest to that is the Fostex TH600/TH900 with the piercing 5500Hz peak that I want to bug you about so I can put together a notch filter in a cable.