We originally thought you could hop off/on as much as possible, as we have done in other cities. This company only allows you one time around the loop and you can get off/on along the way, but you cannot go around more than once. That wasn't a deal breaker, but just a minor annoyance.
The main problem we had, was that we waited for a little over 45 minutes at stop 14 with no buses. About 10 minutes after we arrived at stop 14, a group of 6 elderly people and a young couple with a child arrived as well. We all verified that we were at the correct location, because construction was being done on the street. Buses were supposed to be arriving every 20-30 minutes. It was getting late in the day, and after waiting a while, the 6 elderly folks decided to try and walk back to the main stop, because they thought walking with their bad knees and hips would be easier than just standing on the sidewalk in the sun. They tried calling a number on the brochure to see if there was a way to tell if there was an accident with the buses, but no one answered the number on the brochure the two times they called. We ended up walking back to stop 1 as well, and the guy that sold us our tickets was still at the podium. It was 4:15 when we approached him. We asked him if there was a problem with the buses right now, and explained that we had been standing at the stop for more than 45 minutes. He seemed annoyed that we were interrupting him as he was on his phone, as he just keep texting and only looked up at us twice, even though we politely asked if we could ask him a question. We weren't even upset about having to walk all the way back to the start, as we assumed there was an accident or something, but this guys annoyance at us asking about the buses is what really frustrated me. When we told him that we didn't see a bus from this company go by in the 45 minutes we were out there, but we did see a few other tour buses, his response was, "well, they come every 20-30 minutes" and then shrugged his shoulders without looking up from his phone. We also told him that a group of elderly people walked back as well, after trying to call the number on the brochure and not getting a hold of anyone, and he looked up at me and raised his eyebrows, didn't say anything, and then looked back at his phone. His expression said, "So?" It was a little annoying to waste so much time just standing at a stop without a bus coming by, and then having to waste time walking back to the first stop to get our car, but the most frustrating part was the employees absolute lack of customer service. It has been a long time since I felt that disrespected by someone, as I try to find the good in everyone and it takes a lot to get to me.