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I use them all the time. For modern city settings, I have a 3'x3' street mat I pieced together from two vinyl/rubber 2'x2' Mars Attacks mats from Mantic (the A and B note the positions of plot points in the scenario):I also have a couple of nice cobblestone street mats for quainter settings, one from Micro Art Studio and one from Front Line Games. FLG makes many different mats in various sizes, and ships world wide.
How did you piece them together to get 3x3? I've got 4 of these mats that i piece together to make 4x4 but i prefer 3x3.