PROS: Good solid build quality, great overall sound, lightweight and comfortable, plenty of output
CONS: The sound isn't quite as flat and the mid range is slightly scooped compared to more esoteric headphones. Would have preferred a detachable cable.
OVERALL: I've been using these headphones for primarily tracking vocalists and various musicians. The DT770's are pretty lightweight and very comfortable even over long sessions and are possibly the most comfortable I've used. The sound is pretty detailed with excellent bass response and the soundstage is very good for closed back headphones! They don't sound boxy like quite a few other options I auditioned at this price point and the overall listening experience is very enjoyable. I've tried these on a number if devices from mobile phones to audio interfaces and high end headphone amps and they have plenty of output. My only criticisms would be the mids are a little scooped which can initially give a bigger more exciting listening experience which you need to take into account when using these for mixing. I would also have loved the cable to be detachable but this isn't really an issue if you use them sensibly. Overall though, I love these for tracking (and mixing once adjusted to their more scooped sound) and can highly recommend them.