We did it last year and thought it was one of the absolute best things we've ever done at WDW! It's a great mixture of animal watching, adventure, and tasty and unusual food. Leaving the regular walkways in AK to trek through the woods was so much fun. Getting so close to a hippo and watching it eat was fantastic. If you like animals, you will thoroughly enjoy the experience.
As far as tips go, make sure you allow plenty of time to get to the meeting point for your tour with enough time to use the restroom. They claim they will leave you behind if you are late getting to the meeting point. Two guys in our group were late but they opted to hold up our group and wait for them instead.