Actually I used a 21" and a 27" monitors for a while and when dragging from one screen to another worked, but in truth I found I used the larger screen probably 90% of the time. The smaller screen was relegated to things I parked there for occasional reference. It was a bit disconcerting dragging from the larger to smaller screens and with the new "seamless" dragging promised in Maverick I would imagine it could be really be visually disconcerting..
