The actual screen, not including the frame, of the 27" monitors is 13" high by 23" wide. The 27" displays are so crisp you can easily use higher resolution smaller fonts and retain excellent visibility. The disadvantage of two monitors is two fold, they cost $999 each, and they take a lot of desktop real estate.
Multi-screen setups are nice and given the promised enhancements in Maverick I might well consider two or even three less expensive 21" monitors.
