I have them and I don't use them until late summer. They are GREAT for leaves when they fall but in spring when the grass is lush and heavy they don't do that good a job. In the spring I use high left blades, they force the grass up and cut just a like a barber does with his comb.
Right now everything is so dry here in the Paducah area that it's like late summer as far as the grass goes and the gator blades work fine.
A Government that does not trust its law abiding citizens to keep and bear arms, is itself unworthy of trust..... - James Madison