We got married at Shark Reef in Mandalay Bay and were required to use Cashman for the ceremony. Overall they did okay but I've experienced way better. There is one set of photos near the octopus tank that turned out absolutely terrible and I'm a little upset about that, but they were able to get some good shots. I felt a little rushed through the session (the package says you get half an hour and we got nowhere near that, more like ten minutes) and he missed the shot of the groom's ring. I did not feel like a priority or like the photographer wanted to be there.
The viewing the next day was terribly uncomfortable. They had one 8x10 framed and a small photo book already printed, but the 8x10 they had done was one of the splotchy ones that didn't come out well at all. Their prices are a bit ridiculous, which I knew going in to it, so I'd previously hired an outside photographer for the reception and a tour of the strip. Their shipping charges are very high and they said it would take 6 weeks to print and ship, which was amazing as they had all of the 4x6s already printed for us to choose from for our included package. I'm glad I did that because if we only had the photos from Cashman I'd be terribly upset.