The tour was fantastic. It's just that one should know to get there early as you have to get in the line to get the tickets. Some of the tours sell out so we went at noon to get the tickets and all english tours were sold out for the remainder of the day. Had to take the tour the next day. Wish I would have known in advance, I would have gone the day before to get the tickets.
VIATOR DID NOT TELL US TO CALL THE OPERA HOUSE FOR SPECIFIC TIME. The voucher stated go to box office for exchange for ticket. DANNY AT BOX OFFICE WAS EXCELLANT, EXCELLANT, EXCELLANT!!!!! Thank you so much Danny for fitting us in. He felt so bad every time was filled till noon. We were there at 8am to get on the 9am tour. Do not book this tour unless Viator changes their instructions to call for a timed appointment. Call the opera house directly for tour. Be save not sorry.
If you are going to Sydney, don't miss this tour. The Opera House is an impressive building inside and out! Our tour guide was very informative regarding all aspects of the history and current events of the Opera House. It was very interesting to go into several of the theaters and learn the flexibility of each one.