This is the tour to take if you want to see a lot of the essential DC sights and you don't have much time, or if you want an overview before you pick favorites to explore in greater depth.
We had only one day, so this tour was a natural, and it satisfied our needs perfectly. The bus was comfortable, the group not too large, the guide was knowledgeable and enthusiastic and you stopped at all the key sights for 15 minutes each or so....enough time to be satisfied. We saw the White House, the Washington Monument, the WWII Memorial, the Korean War Memorial, the Lincoln Memorial, the Jefferson Memorial, the Vietnam Memorial, etc.
There was a 1 hour lunch break on the waterfront in The Anthem entertainment area, followed by a 1 hour water tour on the Potomac
Really full day, and very rewarding