Suzanne was a great tour guide, friendly and knowledgeable. It was literally freezing in Red Rock Canyon when we did the tour (it snowed) and it was still enjoyable thanks to Suzanne.
The only thing I would say is it is very possible to do Red Rock Canyon without a tour if you are coming in to Vegas with a car like we were. However if you want a guide and a comfortable all-terrain vehicle, this is the way to go.