I've been using DT-770s for years (literally years now). I have two pairs now. One for home use, and one for mowing lawns, outdoor work, travel. Mine are 32ohm cause (while I have a portable head phone amp), I find headphone amps cumbersome.
I "think" the advent of blu tooth headphone drove down the value of other head phones. The first time I bought DT-770s I paid $220. The second time $180. I noticed that those Sony headphones everybody loves went down from $150 to like $80 to (which is a steal).
EDIT/FOOTNOTE: That said, I've had AKGs and Audio Technicas.... I love both brands. The DT''s are just the panzerfaust of headphones for me. I would probably still use this one Audio Technica model but the wire broke, and I didn't know better at the time, and I wanted to try something new so I got the DT's. I have a backup pair of AKGs somewhere (this isn't like my pedal collection, I only have three pairs of head phones

). My only beef with them is my own fault. I bought an Open design instead of Isolated. They're wonderful though, and should use them more.