I really enjoyed my time with the DT880/600.. but in the end, I decided to return it. I love the tuning.. neutral, controlled, clear, and possessing excellent frequency bandwidth & dynamics. It sounded terrific from the BH Crack.. and even better with the Violectric stack (V800+V200).. If I was an audiophile on a budget.. I'd get the DT880/600 and a Lake People G109 amp and be extremely satisfied. The DT880/600's soundstage is wonderful and I love how transparent the midrange (and, really, the whole sound in general) is. Comfort is, of course, sinfully good... and I really liked the build: very lightweight.. practically "flexible".. but still sturdy and secure when worn.
The only thing I felt it lacked was the detail retrieval I expected. At the price point, I think it's great.. and it certainly isn't lacking in the grand scheme of things.. but my ears have been spoiled by the HD800, JH13, FA-002w HE, etc.. so it's not really surprising the DT880 came up a bit short (compared to those TOTLs) when it comes to resolving ability. Also, I found the sound to lack a little bit of weight.. it was impeccably quick.. but I thought it could stand to have a slightly 'meatier,' thick sound. One other thing I absolutely loved about the DT880/600 was how smooth it sounded.. arguably, one of the smoothest phones I've ever heard. Yet, that smoothness might also be attributable to the glossing over of detail at times.
I still really loved this phone and have very few issues with it.. the only reason it's getting returned is cause it has to sit next to the HD800 & JH13, everyday (not a lot of phones are going to come out ahead of those two).. and I only have two ears.. so it's pointless to keep a bevvy of phones with me.
If Beyer ever upgrades the driver in the DT880/600 (and keeps the price inder $500), I'd surely be in line to buy it again... a very impressive phone!