San Francisco, California
Service was successful once we were picked up, but the process before was very clunky. The transfer people didn't even know what Viator was, and it took persistence for us to get them to believe we booked through a reputable source. So we spent way too much time on the phone sorting this out.
Note from Viator
We are sorry for the hassle experienced in your re-confirmation. We put information on the voucher to assist in confirming with them, however on occasion these things can occur with operator error. We apologize for the inconvenience.