Patrick, our guide was fantastic - really knows his stuff, both culturally and geographically within the park itself. He really is the person to show you the park and surrounds - highly recommended. No problems at all with Patrick or the tour company.
However, the Hummer is not the best vehicle to use for such a tour in my opinion. Why? Well, when you think Hummer you think big right? They are big on the outside but fairly cramped on the inside. Especially if you are put in the back seats like we were for half the tour. It was cramped and with restricted visibility. Not good when you are paying that sort of money. In my opinion, a van with easy access and good window viewing for everyone would be a better option.