we did it last year in november.
while it was cool going backstage to the CM areas at epcot, and under the utilidors at MK, the hour spent in the laundry facility was maybe one of the slowest hours of my life.
i'm glad i did it to see the bits we did do (if we didnt do it, i'd have spent the time going "i wish we'd done backstage magic"), but i should have just stuck with the KTTK tour.