I have changed many automatic heads, but this one has no rival. Durability, ease of filling with nylon thread, which, if placed correctly, never stays inside and releases with a strong hit as needed and not more than necessary. It has a slightly high price, but it compensates with its ease of use. It requires caution on very rocky ground as the outer plastic wears out.

I give it 4 stars (and not 5) because the first head, which came with the machine, broke after 15 days (let's say a maximum of 20 hours of use). However, until then it was great, so I bought the same one again and, until now, about three months, it works perfectly. I hope the issue with the initial one was just bad luck because otherwise, I don't think it justifies the price. Other than that, it works great. It turns everything into dust with a 4mm string. If I have any updates, I will come back.