AMES2917200 Saw-Tooth Border Edger with T-Grip, 39-Inch

Is this actually an official product from the Ames company, with a 15 product warranty, or is this a knock off?

What is the best way to use this along my side walk and drive way ect and make it look clean cut and nice?

Hey ya'll, i'm 67 years old, female, 5'5", 115 lbs. will this work for me? i have red alabama clay, but know to do this after a good rain.

how tall is the blade?