I've considered buying a dedicated edger...but I only have a coupla properties that might benefit as I am satisifed with using my RedMax string trimmer to perform all my edging. Unfortunately, these properties have similar issues which I'll describe below. I'll call this a gravity problem: these lawns are on a slope & are irrigated...and the land seems to be creeping onto the sidewalk and/or curb as the property sits higher above the sidewalks/street-curbing. I can achieve an edge over time by string trimming...but come Spring I'm right back to having to spend alot of time string-trimming the edge. To complicate this scenario, these yards have small plastic sprinkler heads that are adjacent to the sidewalk/curbing. I'm afraid that an edger would really mess up these heads as there's little to no space between them and the concrete. My string trimmer has never damaged these heads. What would you all do?