Purchased a Groupon a few months back and used it this past week. It was for the tour to the Hoover Dam, and it was a great price. Luckily we didn't run into any issues like in the previous reviews. Our shuttle was on time, but due to severe Valet traffic it was about 20 mins late to another pick up. We got checked in very quickly, got a sticker and were told which bus we were on. The snacks in the lobby were not free unfortunately. Stan was our tour guide, and was awesome! He spoke the whole time (which might have been annoying to some, but I didn't mind it.) He was really knowledgeable. I liked that he included a few personal tid bits here and there... made it feel more like a conversation one would have with another person in a car lol. The trip did take a little longer than expected, but wasn't too bad. The real downer of this trip was having to wait to get dropped off at your hotel. I think we would have had a total of 12 stops if we waited till the end. Stan did mention that if we wanted to get off sooner, we could get off and take free shuttles etc. He wasn't pushy though, he said he'd gladly drop all of us off at our hotels no problem. Overall, I think the trip was worth it!