Got the DT880 pro 250 ohm on Saturday. However my reasons aren't for hifi listening, but for mixing. I was using the AKG Q701s for mixing but my problem was that I was always overcompensating when dealing with bass and lower midrange. The DT880, I'm pleased to say has a fuller sound in the bass and midrange areas despite having a hotter treble. The hotter treble has already helped me a lot as I've found, and dealt with, some nasty upper harmonics from a synth which even the Q701 didn't flag up as being particularly bothersome.
It's nice to have a headphone where the raw truth is considered more important than sounding pleasant.