I went on this tour several years ago and just loved it!
Disclaimer: I'm such an "animal person" that I've been volunteering at my local zoo for 15 years, so I may be biased. In fact, I may be pickier than most folks because of my access to animals at my zoo!
I thought this tour was very well done. You learn tons of things about how they prepare the food for the animals, info about their day-to-day care (including veterinary care), see some animal holding areas and usually get to get pretty close to an animal or two. We saw the rhino area and got to get very close to one that was "offstage" in his pen. We also got to see a cute little baby croc (they brought it into the room at the end of the tour).
I would highly recommend this tour!