Viator is indeed a legitimate company. It's a third-party booking site and one of the leading travel websites worldwide. Owned by TripAdvisor, it offers a wide range of travel experiences and activities around the world. Viator has established a strong reputation for providing high-quality tours and activities. It also has a lowest price guarantee, ensuring that you're getting the best deal out there. If the same tour is offered cheaper elsewhere, Viator will refund the difference. Reviews from customers give it an average rating of 4.3 stars, indicating a high level of customer satisfaction. However, as with any third-party provider, the overall experience can depend on the specific tour company. Therefore, it's always a good idea to read reviews and see customer ratings to ensure you're choosing a good quality tour.