I just finished my first year in the business and my accounts are exclusively small, residential lots. In an attempt to work "smarter and faster" next season, I want to reduce my edging time. I currently use a walk behind edger. I have used an inverted string-trimmer from time to time. However, I'm looking for a cleaner, straighter edge than I sometimes get with this method. Should I go with a commercial stick edger or some type of trimmer attachment like I found at www.edgit.com?