Well, I did a little comparison using the solid backs on my Phils and using the open back. I can definitely say for big orchestral music the open back wins hands down. However, in my room and in my opinion the closed back I got has its merits. Without a center channel running, I like the closing off the back because voices are a bit clearer and everything is pushed forward.
I don't think more detail is needed, I think the closed back is fun to play with, but for everyone else it really isn't necessary and I think PENG will come to love the open back design when he gets it
I know I do.