Summary: The DT770 is a lower priced model of the Beyer line, but it is a boiled down version of the Beyer sound and one of the best values in closed headphones. While known for excellent bass response generally, you will also find them one of the most comfortable in the price range.
Pros: Bass quantity and range, comfort for extended listening, easy to drive
Cons: Recessed mids mean it's not the best choice for some. Earpads lose their shape after time.
Summary: I'll preface my review with that I am not a seasoned audiophile, so I don't know all of the jargon, but I do appreciate good sound, and I like what I hear in these. They are by far the best sounding headphones I have ever listened to.
Granted my collection of headphones is very limited.
Pros: closed circumaural design, 80ohm design allows use on portables in a pinch, very comfortable
Cons: Eardrum-piercing sibilance prior to break in completion, break in is quite long