We did Backstage Magic in May, and we loved it. We started at Epcot, got to see how American Adventure works, some info about the architecture back there and a great look at the backstage area behind Epcot. At Hollywood Studios they took us through costuming which was absolutely amazing. We got an upclose look at some amazing dresses and costumes that were being worked on, and it was really cool. I think it was one of my favorite parts of the tour. Just the details on the dresses and costumes were unbelievable. We also got to see one of the ToT cars being worked on which was really interesting also.
We also went to the shops behind the MK and saw various ride vehicles being painted and repaired- when we were there they had the possum from BTMR out on one of the tables for surgery and it was really interesting. Everytime we see the possum now one of us points it out and mentions the tour

We also saw one of the props from Little Mermaid being worked on too.
At AK we saw the building with the parade floats and got to see them up close. That was pretty cool as well.
At MK we saw the tunnels and some trivia out on main street. Using the backstage entrances was pretty neat. My only gripe was while going over the Main Street trivia, we were standing in the sun and dripping sweat.
We also stopped at the garden area which was amazing. Our tour was during the flower and garden show, and we got to see many half assembled topiarys, and they allowed photography back there.
Lunch was at Wilderness Lodge, and I think they went over some basic trivia while we were on the bus, but it seemed more like a pit stop than a point of interest.
Our high points were the shops, the garden area and the costuming department. It was really surprising how much we liked the costuming part, I did not expect that.
Overall, we thought the tour was worth every penny and it really changed the way we look at a lot of things. There's a lot of things we point out to each other at the parks now and say "hey remember..." with.