Ive been doing this for years, and I honestly think that Im a pro at cutting in and maintaining an edge. I use a reverse 45 degree angle ( using my string trimmer ) Ive got a shinny combo unit and Im thinking about buying the edger attachment. Is it really worth having one? Is it any better than using my string trimmer? Toss em at me: all the pro's n con's and everthing inbetween.