I got one, and it stitches, out of the box. Maybe I got lucky. Never tried it on the supplied "tripod" and instead mounted it on my own wooden base. There is a picture somewhere around here.
Since I got it and sewed it off, I never used it and am still contemplating either buying a copper and chromium plating kits and plating some parts myself or taking it apart and sending it to be chrome plated because all that is not painted is bare steel and doomed to rust.
I got this machine locally, from an eBay seller in my city, and it only cost me about US$150, at my door, so I do not see a point in buying from China directly.
Today it is even CD$20 or US$15 cheeper than what I had paid: https://www.ebay.ca/itm/193082243092