Bought in 2014 and just broke in 2020. 100% home use on Stihl FS85R. The product fit perfectly and worked for 6 years. I'm not sure what to expect in terms of durability, but the price was right for me. I would bet 4.5 if it were possible. Not a full 5 because I'm swapping again, but I'd buy again anytime if there was still free prime shipping on that particular product.
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