I have both a 10x10 and a 12x12. Why, you might ask?
I'll use the 10x10 when it is just myself and my wife camping. When with more people camping, I'll use the 12x12.
These "gazeebos" are fun to set up (it's pretty amazing that something packed so small can quickly become a comfortable out door enclosure. I am just impressed with the quality of construction, specificly the zippers that move easily and close completely. Lastly, it easily folds down and fits, without a struggle, into its carrying case.