I highly recommend this tour! The castles were all very different and quite beautiful. A word of warning, it is cooler in the Loire Valley than in Paris and Chambord in particular is cold, so dress warmly! The content of the material presented and the castles were wonderful. My only disappointment is that we were in the Spanish and English group so the time was split between each language. I think this took away a bit from the tour and slowed us down a bit on the tour, but regardless, would do it again!
The trip itself was good. The bus was comfortable and a good way to see some countryside and drink champagne. The downside was that my reservation was not registered and almost could not go! I made them online and the reservation was not in the system when I got there. Fortunately, it worked out, but was not happy with the reservation system.