Certainly this is not professional equipment but it's good, I'm an amateur and my little piece of garden is ideal.
At first I was breaking the wire often because I insisted too near the stone but now I took the shot and I break less often the wire.
Additionally the system that brought out some thread at each start is really well thought out, no need to open the case or type ground like with other devices.
It is true that the battery is expensive but a good enough autonomy and may be used in other brand devices.
I also have a chainsaw that works with the same battery and in the end we win ..
What pleases me most is the ease of use, the battery is slid into the bay and is set, no fuss ..
The weight is very reasonable and ergonomics allows use without effort ...
Anyway, for now I recommend this camera for those who want a simple-trimmer use and maintenance ...