Absolutely the best way to see DC! It was the first time we were in in Washington DC and after waiting a couple days since our tour, seeing the city day vs dusk, dusk wins hands down.
Paul was our tour guide and he did a phenomenal job telling us about all the great sites, stopping at certain places for us, walking us up to certain memorials and tossing in a few laughs during the tour. The city is huge, has so a lot history and yet we left feeling well informed and the city was wonderfully read.
We would definitely recommend and even do the tour again just because it was such a fantastic experience.