If I could give what they deserve, they'd get ZERO stars. Our $1127 private day tour to the Great Wall that was booked well over a month before the scheduled date was cancelled just a couple of days before we were to leave on our trip. And what did Viator do to help us find another tour? Not a damned thing. About 6 months ago, our tour was cancelled as we were walking to the pick-up point the morning of the tour. What did Viator do then to help find a replacement tour? Not a damned thing. I should have learned from the first experience and not booked with them again, but I was assured that cancellations are RARE. Let's analyze the data: In the past 16 months- 4 tours booked, 2 of them cancelled. They can be happy with a 50% fulfillment rate, but I'm not. I won't be booking with them ever again.