Hello friends, my opinion regarding the su Kam shiny 900Va 12V Pure Sine Wave Inverter is mainly useful for the power supply of durable devices. when there is number devices that time urgent need for power cut situation we use this type of inverter AC for such devices. I personally perfer such product because this product having cheaper rate as well as durability. in this inverter we can use power to limited devices only, there may be improved version of such inverters are available now. but comparitively it is cheaper and more accessible product. it will give minimum power for the power cut situation, it is based on the usage of such product. I think this product is useful for the medium level people.