For anyone who stumbles upon this old thread of mine, here's an update - I originally bought the AD700, and used them for a few years. I loved them, although they squeezed my head a little. However at the store where I worked they had the A700s, discounted because of them no longer being manufactured or something, so I ended up getting them, since they were originally recommended by many on this post. I must say, after almost a year of using them, they do sound better than the AD700, and the cup design is more comfortable and less squeezy. Music is more natural and flowing. I noticed that I don't like mids much. I equalized mine down to -12, the lowest it goes, and it sounds amazing.
Also, a friend of mine from work has the Beyerdynamic DT770s, also highly recommended by you guys, which I couldn't try for so long being they are twice as much as the AD700s and whatnot. Those seriously take the best parts of both AD700 and A700, and combine them together. I would totally sell both of my headphones just to get a pair of those, they sound so good.
So yeah, I haven't gotten to test much, but the A700s are wonderful for lots of music listening that I have used them for. They don't rumble with base like some, but the lows still have great clarity to them, and shine in their own way. And the audio doesn't leak nearly as loud as I expected with them being open cans. They are about as quiet as earbuds when others are using them.