I used my edger 3 times before I reviewed it.  One of the best investments I've ever made.  Unbelieveably easy to use, and when I think about when I used my manual one...sooooo sorry I didn't buy this sooner.  Two tips.  As with any edger, best used when the ground is dry otherwise mud will stick in it, and when edging, (I learned today) run it back and forth along the edge as any grass that bends over when going forward, will be cut off when you run back over it...a nice clean cut.  Absolutely fabulious and the price can't be beat.  Don't struggle with the manual one for years like I did.