As a fellow DT770/80 owner I can say that it took me a good three weeks to warm up to them. I thought I made a mistake and bought a pair of cans I'd never use, mostly because of the recessed mids. Well I'm glad I gave them a chance, because now that I'm used to their sound they are my favorite pair of phones for any sort of electronica or groovy type music (think jamiroquai). And since thats mostly what I listen to, that would make these my favorite headphones. The bass really doesn't seem overbearing once you are used to them as well, it seems.... normal
This headphone is also night and day when listened to on a good amp versus a bad amp. It sounds absolutely horrible without an amp so don't even think of trying it. I recently upgraded my PPA with some GM buffers, pure copper vampire RCAs and a stepped attenuator and the DT770s midrange really started to emerge with the upgrades, making it much more balanced.
So if you like electronica/groovy music and you have a good amp, these phones were made for you!