I love the fit of the AD700's, some people don't like the wings, they fit great for me. How are your A900's for immersion and isolation? I noticed when gaming with my HORRIBLE Bose 'phones that I could hear footsteps and general sound directions better than my 700's, even though they are muffled to the point I get a headache, lol. The soundstage on the Bose is probably microscopic, so I don't know why this is happening. Maybe my ears work better with closed headphones......or maybe the soundstage of the AD700's is TOO big for my hearing?
I love the wings on the Audio Technica headphones as well. They help to fit my head perfectly, without too much clamping force, and they stay snug despite moving my head around.
I've only head AD700's briefly for music, so I can't really provide a comparison for gaming. The ATH-A900's were in the old recommended headphones thread as being great all around closed phone (movies, gaming, music) and I think I would agree. I share a room with my sister for our computer set ups (she does sit ~12 ft away though and has her apple iems on 50% of the time) and she's never complained when I'm using headphones for gaming, music, or movie watching. I play mostly TF2 nowadays, and footsteps and emotes directionality are easily discernable.