The tour was all we could have hoped for and more.
The glass top bus is ABSOLITELY worth it because on a beautiful night like we had it is a convertible and the bus becomes open air.
The tour hit every major monument/memorial we wanted to see and provided adequate time at them all.
Our driver, Smokey, was excellent on all counts. A safe driver, a knowledgeable guide, a very nice man, and a great singer as well.
This was a fantastic experience all around and I would recommend it for anyone - whether it be your first time in DC or if you have only visited the sites in the daytime this is a must.