Steve,
I ordered a set of ball type bearings from one of the vendors who swore they were made in America. They were not. Big 'ol China stamped on the side of them and they were sloppy in the races. You shouldn't be able to feel movement in a bearing, and these were sloppy.
I sent them back and ordered MBS, Japanese ball bearings and haven't had a problem since.
I agree with bigbadswingdaddy wholeheartedly on the quality of bearings.
Jeff