We just got back from a 3 week trip to California, and took this tour on a Tuesday. I know Friday was also an option - not sure about Thursday. It definitely wasn't offered every day.
It was a fun trip - and enough to get us hooked on
ABD! The Studio tour was great for history/architecture buffs, but the kids might not have gotten much out of it. Filming was on hiatus while we were there, so no one exciting was on the lot (much to the chagrin of one of the teenage junior adventurers on our trip!).
Our tour guides were great - native to the area, one normally worked in Guest Relations at DL doing VIP tours, and the other worked at ABD corporate in Burbank. We hit Hollywood & Highland, saw the Dolby Theater, had lunch at the Farmer's Market, and then spent the afternoon at the studio.
I enjoyed the tour, but it's obvious that the Walt Disney Studios is a working studio and not set up for tours. It was a lot of history, buildings, and photos on walls. There was some cool stuff, and we got to see sets from an upcoming midseason replacement comedy, but I was surprised the kids on the tour lasted through it all - there's not much there to interest them! Our DD loved it, though - and honestly, I thought it was a much better tour than the $49 Warner Brothers tour must have been.
The best part was getting to meet the guides and other adventurers, and seeing the others at the parks and the hotel the rest of our stay. It was kind of nice to see people we knew! I'm very much looking forward to our next ABD - we're planning on China, but not sure when yet. I'd love to do any other trip they offer, though - they're that good!