This looks like a super quality tool, and it cuts well but it as a long reach trimmer it is too heavy.
Another problem is that it has two switches that have to be held down at the same time to work, but when the extension is fitted they can be over 2 m apart. I could only use it by taping down the switch on the cutter head.
The cutting gear unfortunately made it too top heavy for me (.the cable also adds weight) Its would be OK if you are fit ,young & strong. But if you are comfortable with the weight it would appear to be a good tool, just not for me.