My wife and I went on the tour a week ago and we loved it. Our guide Nicole did a fantastic job and we really learned a lot. She told us that if we had a camera, we were permitted to take pictures in the MK, but as soon as we went "back stage" we had to put it away (that included cell phones).
For the two of us it cost $120 total (we did not use the Visa discount), but again, it was well worth it. I scheduled the tour at the hotel (Wilderness Lodge) when we arrived and they had pleanty of openings throughout the week. We are seriously thinking about taking the "Behind the Seeds" tour in the Land when we go back in a couple of years.