This is my first, "important" post in the forum, I've being reading a lot of reviews and posts to decide which headphones I should by for upgrading from my HD515, unfortunately I bought them in BestBuy and WAY overpriced because I live in Mexico and is very hard to get good headphones, the stores are filled with Bose and low range Sony, Panasonic and so...
I decided to go for the Beyerdynamic DT990, I bought them on line and ship them to a friend in US. I just got them 5 hours ago. All I can say at this moment is that I found them great, I'm ambivalent about the burn-in process, I've being running them for about 4 straight hours with a new FiiO e7 and a MacBook Pro as source, with FLAC and MP3 files. The respose so far is great, the MOST notorious thing about them is the detailed they are, I'm hearing things and nuances that were not perceived with any of my old headphones.
I know there are reviews and more experienced users who have commented on the DT990, I'll be posting my main comments on this cans while I run them. Besides what I already said something that caught my attention from the first moment is the weight and comfort of them. The velour is soft and the padding is firm and adapts very well to my head. My right ear touch the internal cover of the driver, it is not a big issue and I notice it only if I pay attention to that.
At the moment the change is huge compared to the HD515 and a couple Bose's that some co-workers use in the office. I'll let them burn all night and see if I detect any changes.