I took two tours with this company, which was recommended by my hotel. Both the green and the red tour were excellent, as I had the same knowledgeable guide, Vedat. The groups are small, 14 or 15 maximum, and tours are competitively priced. From Goreme, the green tour is longer, and takes you to places you really do need a guide for, including the underground city. I'd say that if you want to do the red tour attractions on your own with just a driver, that would be as practical, especially if there are two or more of you, as these sights don't really need that much information or help with navigation as the green tour's attractions do.
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