I have, although it's been a while since I've had the DT 770s (owned them twice). IIRC, the DT 770s, in comparison with the HP 150s, have a bloomy, somewhat unfocused bass, an inferior soundstage, and poorer clarity. The HP150s are far superior, IMO. I'd go straight to the HP150s and skip the HP100s, even though they're comparable.
Thanks, this is pretty much the conclusion I came to from speaking with some other knowledgable folks.
I thought it had been established that any sonic differences were minimal and due to the different cup material?