I have the BD DT880 Pro’s for mixing, and the BD DT770 Pro’s for tracking. Sometimes for mixing I switch them just to hear things differently. They are both comfortable, sound fine, and of course have the reputation of being very flat/unflattering. They don’t sound identical, but I can’t verbalize what differences I’m hearing yet.
The 880s are 250 ohms, I drive them with my Omni I/O interface with a lot of volume to spare, and I can also plug them into my laptop and hear things great.
The hardest thing I found when mixing on cans was that I could hear sounds panned to the sides (reverb, or wide synths, for example) so much more prominently than when I put the same mix on speakers. I’m learning to compensate, very clumsily still, so that things sound good on both cans and speaker monitors. Man, this stuff isn’t easy!