When we went on this back in Sept 06, the safari was the same track as the ride, but it was slower, more stops for pics and such. Our guide was very good at answering any and all questions. Dinner at Tusker House was great. It was closed to outsiders and the food is brought out to the tables, not buffet style. They had characters there for pictures and afterwards, you go outside and they had a few animals for close up viewing. I know there was an owl and a snake when we were there, not sure if that varies or has changed. Everyone in our party had a wonderful time!
We also did the fireworks cruise...that was a hoot! Worth the extra money for us. Also the Illuminations dinner at Epcot was great!!!
I think it is definately worth going on...it's a different experience than the ride open to everyone. Have fun!!