Average quality, but you compromise due to the price. I use it on an Oleo Mac. The field I work on is soft soil, with few rocks. Specifically, I didn't like its "button" that protrudes a lot and easily hits the ground. This, combined with the weak spring inside, results in the trimmer line being consumed unnecessarily. Additionally, it is hard plastic and not metal as stated in the specifications. Another disadvantage is that due to the large protrusion of the "button", it does not cut very low and often forces you to cut with the head tilted.

5/13/2024: I am upgrading the rating to 4 stars because it still works after dozens of hours of use.