Noiz2 said:Also because small details are so distinct little things can sound very prominent that just aren't in the air.
I think this is a pretty important thing to keep in mind about headphones. In my experience, they do give you a more detailed representation of what is going on, which might be perfect for some tasks. On the other hand, you could spend 20 mins tweaking a reverb, getting it to sound perfect on phones. When you check it out on monitors, it's completely inaudible. Never mind all the above points about different stereo representation, lack of reference levels, etc.
Also, it's not that phones don't reproduce stereo sound properly -- for some types of recording like binaural it is probably the ideal form of listening. Not that we care about that for video...
I think a good set of phones is a great thing to check a mix on, but not as the only thing.