Ok, a few more impressions:
The biggest strength is without a doubt how well these cans handle percussion. I think a part of that is merely because of the fact that they are closed, but these headphones have a thump to them unlike any I have ever heard. They also have some excellently crisp highs, which make cymbals sound fantastic.
All around, the resolution here is great. I am hearing every single detail. Some songs it is like I am hearing them for the first time. If I could find a single complaint, it is that the midrange seems ever so slightly veiled. Again, I think that is mostly attested to a closed design. However, in most cases, it is not something that bothers me. I have found though, it is more obvious on poorer recordings.
The biggest thing with these is putting them head to head against my MS-2i. They fall into the same price point, and the MS-2i has been a can I have cherished since the day I got it. Well, the MS-2i seems to have a bit brighter, clearer midrange, but the buck stops there. The bass feels positively weak in the MS-2i compared to the D2000. Also, don't even get me started on comfort. I love Grados, but I hate bowls. I don't think i've ever been able to make it even 2 hours, usually less than an hour, and some times I just can't bring myself to wear them at all (thats what my Sennheisers were mostly for). The Denon's, however, are bare none the most comfortable headphone I have ever worn. The leather pads are wonderful, and the headband is deliciously soft. They are rather lighter than I expected too, for how metal is on them. I have had them on for about 4 hours now without an ounce of fatigue or discomfort.
Also, a few people mentioned gaming, so I will address that as well. I always prefered a closed can to an open one for gaming, so we are off to a good start. In addition, I already addressed the comfort, something equally important for gaming. So far, we have a winner then? Well, how about sound? Yeah, they win there too. Their excellent boomy bass make them a perfect match for first person shooters. Every time I shoot a gun in CSS and it rattles my brain, I can't help but smile. They exercise some pretty damn good sound stage too, another plus.
They all around just feel very right. They have single handedly dethroned three other pairs of headphones. I had MS-2i's for music, A700's for gaming, and HD580's as my comfort/potpourri cans. All of those are now useless. I sold the A700 and HD580 which have in effect paid for these Denons. I am going to keep the MS-2i for a while before I decide to sell them, as I do still really like those headphones, I just like the Denons better. Bottom line, I think these are perhaps the most enjoyable headphones I have ever owned, and I don't see myself getting rid of them... ever. I am going to be putting silver on them, probably tonight. I look forward to finding out what that does for them.