It's difficult to understate how important it is to have a great tour guide that will help you navigate Egypt, and in particular Cairo, well. Moreover, if you are at all a history buff or are just curious about ancient Egypt, Gad is the guide to hire. He is fantastically knowledgeable and well-trained, and will teach you more about the pyramids and ancient Egypt than the best books. 

Gad is also funny and kind, accomodating, and will help you understand modern Egypt and its culture well too. I would hire Gad again, no question.