The machine itself works well. Doesn't overheat. Grinds flour finely.
The machine came with 2 sets of blades. The upper blade that was installed was plated and the plating chipped off into the flour at first use, see photos. Fortunately, the machine comes with a replacement set of blades, and I reinstalled the upper blade with the replacement and that solved the problem. The replacement blades weren't plated, so all is well that ends well.
I haven't had a problem with the machine since.