This is my first battery powered lawn tool and I should have changed over a long time ago. I've used corded and gas powered trimmers in the past and this is just ridiculously easy.I'm 6'2" and the length is just long enough. If I was a couple inches taller it may be too short (I've maxed out the shaft). All of the parts seem sturdy and well thought out.Some things I read and my observations:1. Single string- I have only used low power and the single string is plenty powerful/strong enough for typical yard trimming.2. Feed- this is not automatic feed. If you let go of the trigger OR push the feed button the trimmer lets out more string. This is only a problem if you constantly start and stop the trimmer (which is most likely why some people report the string coming out too much/fast).3. Edger function- the head rotates for edging. It edges pretty cleanly once you figure out where the string contacts the edge. Again, a single string on the lower power was plenty for the edge of my driveway and sidewalk.I'd totally recommend this product. The batter has lasted two full trimming cycles for my lawn which I did not anticipate- my trimming (front and back) is probably a bit over average size for residential properties. The battery life is a pleasant surprise even keeping on most of the time- so the string didn't keep feeding.Haven't had to replace the string yet, so I cannot report on that.