I covered my entire patio with these tiles, a total of 312 sq ft. I used these gray tiles along with the dark evergreen tiles to checkerboard my patio in 4ft x 4ft squares. It was very easy to assemble, nearly every one snapped together with just stepping on the joint or sometimes stomping a bit with my heel. I was wearing leather sandals, so I did have to smack maybe a total of 4 of them with a rubber mallet. The entire job took no more than 2-1/2 hrs for a 75yr old man.
I'm very pleased with every aspect of the finished project. Only time will tell how pleased I will be with durability and weathering through a hot summer followed by a cold winter. They appear to be high quality, so I am optimistic.