I was disappointed to find out that I paid more through Viator than if we would have booked direct. The tour was ok.
Our tour guide Adrian was friendly and knowledgeable about San Antonio and the sights we traveled to. We were the only two people for this short (1 hour) Segway tour and even though my machine ended up with a flat tire we had a great time. We were even offered the opportunity to take a 2 and a half hour tour the next morning for free because of the flat. We declined but really appreciated the offer.