Great, so let's say 60% of volume wouldn't be so tragic? I would not listen to music at full volume...I sometimes go to bed with these on with the missus by my side. She falls asleep no issues.
They do leak, like any other open back, but is not the end of the world.
And what about dac/amp? Also, how are they for indie, folk, rock (Brandi Carlile, Sigur Rós, Florence + the machine, Katie Melia, etc), female vocals? I think I read somewhere that they are really good all-rounder.