I got by with using a string trimmer to edge my driveway and sidewalks for years. The results were typically acceptable until I got off track and mangled up my groove. This attachment eliminates 95% of the room for error. Build quality is very good and I expect it to last a long time. Swapping out the trimmer to the edger is easy provided you keep some grease on it. What you're left with is a remarkably clean, precise edge. On a sidenote, I've read that others edge before they mow. When you edge, you leave dirt and grass clippings on the concrete that the leaf blower can push right back into your track. In theory, the mower can act as a vacuum and move some of that debris back onto the grass. (Just a tip I thought I'd share.)