I have tested it for about 5 hours in total so far. I have used 2 batteries of 2.5 Ah. I will buy a 4.0 Ah battery and try it again. The string it has on top is not even good enough to cut a small blade of grass. I put on an Oregon string and will also try a Stihl pro. It lasts about 15 to 20 minutes depending on the usage and how hard it is pushed, etc.

I come from a Kawasaki 3 hp lawnmower which broke after 15 years. They are two completely different machines obviously.

Cons:
It has a single string output!!!
It only takes a maximum of 2 mm string and with difficulty 2.4 mm.
It does not take any other head, only the one it comes with the single output.
It is relatively limited in capabilities for tough grass, etc. (I repeat, I will try it with 4 Ah batteries and a tougher string, nylon).

Pros:
You put in a battery and you're ready to go, no gas, no fuel, etc., and it doesn't move forward.
It folds in half and can be easily transported in the trunk.
Much less noise