I went through DCA security this evening for the 5:30 Shuttle to LGA. A 10-minute wait in line, then no muss, no fuss. Even wearing my belt and Rockport shoes, I didn't set off the metal detector. A HUGE contrast to LGA, which is simply the pits.
I also object to the silly no-standing rule, but I would never trade the convenience of DCA for Dulles.
Bruce