What can I say? This works! I bought this half-heartedly thinking, "well, if it doesn't work ,I'm only out 30 bucks." I prepped my bare spots well (tilled and weeded the soil and mixed in some bagged topsoil), cut the roll into the shapes and sizes I needed for each spot, and watered it religiously and according to directions. It worked. The green mat has completely broken down back into the soil, and I am left with nice grass. I am going to buy another roll to fill in the rest of the spots now that I know I can trust this to work!
(long story short: I'm a big skeptic, didn't think it would work that well, but it proved me wrong!)