They look fun to have when you make pizza. But, how often to you make pizza? Or...how often do you think you would make pizza if you had one?
To me, it seems like something that I'd use a few times a year and the rest of the time it would take up space in the garage. Then, when I want to use it, I'd have to clean it from all the dust and spiders.
I make pizza just on my gas grill that I like just fine.