I have 4 acres three of which is horse pasture and 1 is lawn/natural landscape. I took them at their word when they said this could be used in commercial applications. I have an Echo commercial trimmer with a straight shaft. I purchased the Delux stainless steel blade thinking this would last longer and be the best choice for my yard. I just got finished using it for about an hour and here are my results. It is so heavy I thought the trimmer was going to melt down. The shaft area was so hot you couldn't touch it. It put a very excessive load on my trimmer.
Second, In the hour that I ran it, my trimmer used about twice as much gas. Next, It was so heavy and vibrates way to much. After 1 hour it almost killed me. If you've got regular little grass it may work fine but don't go after any weeds or tough grass, it won't cut it. As soon as I rest up and can use my arms again I'm pulling it off and putting back on the string. I wasted $35.
Bottom Line: No, I would not recommend this to a friend
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