I was skeptical about this however the good reviews gave me the warm and fuzzies so I purchased it about 2 months ago. I've used the whole summer season now and have to say IT'S FREAKING AWESOME! Seriously it's wonderful in several ways. It does great straight lines for edging, it does beds and culverts with absolute precision. Literally it makes a novice a professional almost immediately. It really helps on my St Augustine grass to trim a nice flat area without going to low (which is death for that type of grass- can't go too short!).I think most importantly it adds a level of safety by acting as a shield to keep flying grass and rocks down and away from hitting your ankles and windows.It's worth it if you're serious. You can also use your trimmer like normal! This is not made specifically clear however it's no need to have another string trimmer. This only ADDS trip the utility of your existing trimmer. I watched a YouTube video to see how it goes on my echo 225 trimmer and it was pretty easy. I had to order powder graphite as it didn't come with any, it was not much$$ and will last many years. All in all I'm very serious about my lawn care and this certainly helped bring it up a notch!