some of the chinese bearings are really poor quality.
if you get (minimum) ABEC 3 tolerance bearings, you will be just fine. no matter who makes them.
i have used Chinese bearings in different capacities.
in my experience the Chinese bearings have shortened life expectancies, in comparison to a Japanese or German or USA made counterpart in the same grade.
if you make a paycheck from the unit, go German
if you wanna just make it work for a while go ABEC3 Chinese
Shuster is a brand that has served me well in low impact applications