Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Durable and Gives Nice Clean Cut

I've been using all types of grass trimmers and trimmer lines for over 30 years now, but using this product was a revelation. Since I use ear protection, I can't tell whether these are quieter than other brands. What I have noticed is the durability of the product; I am feeding it with much less frequency than with other brands. I've also noticed that the line gives a nice clean cut, and consequently doesn't cause the trimmer to kick back as often as before. This may have to do with the spiral twist design. I'm sold on this product.