I didn't expect it to be SO big, it's a giant and quite heavy, so you need to put it in a relatively powerful machine.
User-friendly and sturdy, and it holds a lot of trimmer line. The trimmer line that came with it was a bit useless so I took it out and immediately put a much better one. Below are links for the trimmer I use as well as the sturdy trimmer line I put in, it takes up to 3mm trimmer line the head says but even if you put a slightly thicker one it will still take it. Two meters on each side fits if it's 3 millimeters thick.
The problem is that many times the trimmer line is cut exactly at the point where the hole is and so the remaining one goes inside, so the whole automatic feeding system not only does not work, on the contrary, it is now a problem because you have to open it and manually remove some trimmer line and even through the hole and with all the springs trying to jump right and left and finally close the head.
Otherwise, you need to check the trimmer line every so often if it starts to be cut so you can hit the button to lengthen it a bit. It also helps if you get an extremely sturdy trimmer line that doesn't cut easily because then if it is cut, logically it will not be at the base.
Trimmer:
https://tinyurl.com/yc39zxdh
Trimmer line I now use for fewer cuts near the base:
https://tinyurl.com/2dxw7y96