I got my DT880s a couple days ago and setup my old Yamaha to drive them. While its not the best synergy, it doesn't seem to have any trouble with the 600 ohms. My first impression was, "Wow, bright!" But after a few hours of usage, they seem to have settled a bit and are much more tollerable. I'm sure more break-in time and a tube amp will help (planning on a DarkVoice 336SE). I'm going to reserve a review until I'm sure I'm keeping them, though, and have a proper setup. The only real problem I'm having is that after about 30 minutes, there is a spot under my ears/behind my jaw that starts to bother me. I'm hoping its just a new headband/break-in thing and I won't have to send them back due to it.
About the sound...now that its less bright than when I pulled it out of the box, I'm discovering just how much better they are than my AD700s. The ADs made everything sound like it was coming from far away (and somehow missing something and I'm not talking about the complete lack of bass), the DTs sound extremely realistic and detailed. I am coming to the conclusion, though, that they won't be the all-around headphone I was hoping for. I think they will replace the AD700 for classical and acoustic, and will work well for gaming and movies. But I'll eventually want to get something with more color for rock and maybe jazz (haven't tried these with jazz, yet).
For now I'm fine listening to rock and jazz using loudspeakers...I prefer the energy that speakers and a sub bring anyway. But looking down the road, whats a good complement to the DT880s for rock. DT990? M50?
Anyway, thanks for reading a somewhat rambling post. Assuming I keep these, I'll put up a review in a few weeks when I've got an amp setup and had some real listening time.
Oh, on a side note, this hobby has prompted me to start learning to play the piano. For now I got a video series, but will find a teacher if I get far enough along. Considering I have access to a piano, it seemed like a wasted opportunity to not at least try.