i think your product is genius. well done, market it well. We dont use this kind of thing around here, not sure it would help much. we have heavy clay soils, seems like it would be too easy to fill up the depressed area and then be just the same. i would think a smaller outside dia might also be useful, i would not want to see all my heads with that much area around them instead of grass in my lawn......understand?
all is fair in love and grass!
Man, it smells like sheet, do you smell that!!