Hi, I got the Nighthawks, and find them great. Coming from the Hd600 and reading comments, I expected the nighthawks to sound alot more bassy and bit more muffled, with a smoother treble. But doesn't seem te be the case at all. In my opinion, they sound a bit more clear than the hd600, and the bass is actually really good. I wasn't sure about the bass after reading so many polarizing opinions about it, but I expected it to sound alot more bassy than this. Bass punch is not great, as it does seems to favor the mid bass more. But overall quality of the bass is really good. The mids had a dip in the upper mids, which is one of the reasons I bought it. I've always thought that the supposedly neutral headphones could really sound shouty with some tracks I listen to. And as according to my expectation, the mids are just awesome, really smooth and no more shoutiness on some tracks. Just what I was looking for. But then comes the treble... I've heard most people say they are smooth, but I consider them a rough treble. They are definitely more pronounced than the mids for me. Sibilance in vocals are alot more pronounced than the hd600. I had to tone down the spike I heard at the 11k by alot to make it more pleasant for my ears. I find the soundstage and imaging really unique compared to the headphones I've listened to. Somehow they sound more cohesive? But all things considered, I really like these headphones and think they are technically really good. These are just some impressions from me with my weird ears that are quite picky on the treble, so take them with a grain of salt.