Not really a good deal. Firstly, its a simulated sine wave, and secondly, both only have 1 bank of batteries meaning that you wont get through a 4 hour load shedding session on an average load of +- 250W without draining the battery beyond 50% i.e. batteries will not have a good life-span
Its no different to the Ellies ones sold all over.
I would rather recommend you get the inverter separately (12V), buy at least 2 100AH batteries, and connect them yourself. If you like the box on wheels, maybe they sell them seperately