I have used one, you cannot say that it's a coincidence it looks like a Kirby, the makers have tried to ride on the reputation that the Kirby has.
No way are they equal or better than a Kirby, but as I have not done a side by side trial we will have to agree to disagree on that. I will try and find the specs of both to see how they compare, but like you say it's half the wieght so it must be a wonder of engineering it it is more powerfull.
When I use the word 'poor' I don't refer to its reliability or longevity....I'm sure they are a well built machine.