We took the tour last fall and did enjoy it. We toured the Central Shops (where most of the attraction/ride props are fabricated), the Nursery (where the topiaries are made) and Textile Services (where ALL of the WDW linens are washed).
The tour meets at Epcot and travels by bus around to the various sites.
We have taken many WDW tours in the past and would favorably compare this to past experiences.