Just received a pair of Sennheiser HD-600 from my wife as a birthday gift yesterday, it is still under break-in period. It is another project for me: headphone amp and replacement cord.........
The reason I got this gift is that I quite often listen to Mahler Symphony No. 2 after 12:00 a.m. (most of time I will repeat the last movement) which is "somehow" annoy to my lovely wife who is already on bed. I am sure this explains everything.
Back to the topic, for me, headphone is a nice alternative. But it is very difficult for headphones to generate the massive energy that some instruments, e.g. organ, bring you in orchestral music.
Happy Listening.
Otto