We took the tour of Talum and enjoyed it very much. The trip is very long so you may want to make sure you're paying a flat rate and have a way back.
When you go there, make sure to go behind the main pyramid and look at the beach from the clift. It was one of the most beutiful views of our entire cruise. My wife still has an 8x10 blowup of a snapshot we took there in here office. She looks at it every time she starts to feel stressed.
Our trip was in June so it was very hot and muggy. A cooler time of year would make the tour that much more enjoyable.