I purcahsed my unit used off of Craigslist. It was advertised as used only a few times which looked to be true. The previous owners were moving into a condo so they had no use for it. I got it home and plugged it in. I have not edged since last year. Some areas it worked great with a back and forth motion. The areas that have thick Zoysia, not so well at first on the 1.5" depth.  What I did was double up on the blade. There is plenty of thread left to secure the blade bolt on to. Now it takes on the Zoysia without issue. I'm guessing once this initial edging is done, the next ones will be much easier. Only time will tell on longevity. So far I give it a thumbs up.