Definately worth the experience.
I have done it a couple of times through the keeper for the day tour.
That tour also includes feeding the lions, african painted dogs, hyena, giraffe, zebra , rhino, etc and you get pretty close it it all.
You also spend time with the vet on whatever might be happening on that particpular day. One of the days we did it, an ostrich had died, so we watched the disection to try and find out the cause of the death.
The cheetah was an excellent part of the tour.