I am wanting to buy a core aerator. Corriher has the 60'' one I think I am going to settle for. How much benefit can I expect to see in my yard? Will it have a significant impact on the quality of my turf? My yard starts to turn brown with the slighest of dry spells. The soil quality is not the best, but is improving because of topdressing and overseeding. The yard is in it's 3rd summer now, still a lot of thin spots and clumpy fescue. Can anyone who aerates regularly advise me.