I have just acquired the DT770 allows me to be looking to make the acquisition.
Good headphone, good build quality is very strong! A headphone will be able to hold for hours of use and years without problems!
For sound, substantial presence of bass, mids are slightly recessed.
Very comfortable, the cushions are super nice anything after a set in a summer heat I imagine that one is a little "heated".
Small detail, the jack adapter is screwed in so that we do not change every two months to jack adapter becaufe HS, well thought out.
Of the cut-18db (headphone off) the sound outside is not really audible, now as any headphone if you made a live set, have necessarily meant the front anyway. Also allows the brand to replace the cushions, etc, so after a few years you can "to update" without having to change the headset again.
I use it for the electro (live set), I think for this use and use radio headset is ideal!
cordially