Though I might chime in on this as well.
Having the RS1i as well as the HD650 for home use, I wanted to pick up a closed set that also won't be too much of a downgrade in terms of sound quality. After doing some reading and looking around, I had my heart set on the D5K. I though the wood look is very tasteful and I've read nothing but positive feedback from those who have had the chance to listen to it. Wanting to find a pair for the right price, I sat on it for too long and then Denon made the announcement for the new line. As most of you who have looked into the marketplace now must know, D5K is now either hard to find or being sold at a premium. That's when I started looking at the D600 as a real option.
Not wanting to spend 5 bills on a brand new set of headphones without first knowing what it may sound like, I elected to wait a bit and see what some of the early adopters say regarding their experience. Also I thought that because unlike the D5K which had wooden cups, the D600 does not and thus doesn't look as elegant, so it seemed likely to me that the market price could come down a bit as it wouldn't hold the old D5K's price point (Amazon has it for $400 new as we speak). As expected, some reviews of the D600 started to pop up as more and more members got their hand on it, but it seemed that many were disappointed with what they found in the D600.
Two weeks ago I noticed OneCall had an open box for $359 available, I decided to take the plunge and check this set out myself. OneCall (Authorized Denon dealer with full warranty) was awesome as they shipped the item out and provided me the tracking number the very same day I ordered. Two days later I had the D600 at my front door. Opened the package, I was surprised to find a completely seal brand new set with all the seals still in tact, it seems that OneCall had sent me a brand new unopened set of D600.
I popped open the box and found the D600 nicely packaged, and of course I immediately plugged the D600 into my setup to see how they sound.
First thought, the D600 is big. At least it looked smaller to me from the pictures.
Second thought, Damn these things are comfortable....
I sat there for a while just listening
40 minutes later...
I had decided that I was completely satisfied with my purchase. It wasn't that I sat there analyzing these cans for 40 minutes and trying to figure out whether they are worth it, but it was the fact that I just found myself sitting there enjoying the sound that came out them.
I'm not going to speak for other as everyone has different taste and preference, as well as what they expect from a product of a certain price range. But I will leave you with my thoughts on these D600 after 2 weeks of listening.
I'm not sure why there are such negativity surrounding this set (actually I kind of do, as most of them came from previous D5K or D2K owners looking for an upgrade)
Since I've never heard them I guess I won't be able to make the comparison. My approach to the D600 was that I was going to judge it by what it sounded like to me, and not how it sounds comparing to others cans that I own. I came in understanding that the D600 is really a different line to what the D7K, D5K, and D2K was, so when people mentioned how it didn't sound the same, that really wasn't a surprise.
I didn't find the D600 to be horrible sounding cans, and definitely not as one member mentioned "non-audiophile' quality (I guess this could also be up to interpretation as to what constitutes audiophile grade....) I found them to have a good amount of detail with slightly stronger bass then probably a flatter set, but it wasn't a bad thing as the bass didn't sound sloppy to me. It is definitely a good complement to the others sets that I have. The D600 are incredibly comfortable to wear, and for these past 2 weeks I have found myself reaching for them over my other two cans on many occasions.
So if you were or are looking at the D600, I truly suggest that you either go to a local store that may have a set for you to try out, or order from a place that has a good return policy. Because in the end, I know I was definitely glad that I gave them a chance to make an impression on me
(I apologize for this long ass post....)