I needed an edger badly to maintain my bermuda lawn that has been sending runners vigorously in all directions. These have been getting onto drive way, pavement and curb areas. I used to have string trimmer but had lousy time using it for edge trimming often with the need to adjust string every few minutes. I was looking for a good solution for the problem.
I found the following and bought at Lowes for about $85 range:
Black & Decker Grass Hog Electric Edger. So far, I have been happy with it. I wanted an electric edger as I am health conscious and cannot stand the gas fumes if I have a choice.

America's Savvy Consumer Research Simplified