We did this tour with Zohery Tours. Thomas was our driver and he was great. He was friendly, funny and had a lot of information. The only thing is we wished that we had a little more time to spend at certain stops like the Vietnam Memorial and Korean War Memorial. We would recommend this tour.
Waiting at the Hyatt Regency for our tour bus, we were a little concerned when after seeing many motorcoaches pull up, our small bus arrived. The tour manager arrived to confirm our tickets, then left the bus in the hands of the driver - who I think was named Paul. We were initial unsure, however, the driver was the highlight of the tour with his years of historical knowledge of the area. He amazed us with all the facts and figures which he easily recalled during our tour. Getting on and off the tour was easy - probably easier than a large coach. The reason we took the tour was to get the layout of the area so better to decide what we wanted to see in more detail. We also had the ability to spend 15-20 minutes at each of the monuments - which after the initial day was a good break from walking. I would recommend the tour - we enjoyed it!
Bus was clean, driver as experienced and knowledgeable.