This map has been very useful for an urban game I run. The PCs constantly find themselves in warehouses. So anytime a warehouse comes up, I just pick one at random, and ROLL INITIATIVE! And if for some reason I have to end the game during a combat, just mark every one's position on the map, fold it up, throw it in my bag, and its ready for next time.
I recommend this flip-mat for any game master who, like me, is lazy and does not feel like drawing out warehouses.