Don't think Vevor actually makes anything. They just brand and market lots of generic Chinese stuff. Some of it is decent and some sucks ass. I've had a couple that were decent. My policy is to buy two whole units. If one has problems I swap them and fix the problem one whenever I get around to it.
Also, marketing them as 8kw is bullshit. These are clones of well made German machines that were either 2kw (which are physically smaller) or 5kw. Actually pushing them to 8kw would be far exceeding the design parameters of the much higher quality German machines that they are copies of. My suspicion is that the 8kw claim is just an outright lie.