I have been sending panels to Elecrow for many years and every board has been produced perfectly without a single missed hole, or a short between tracks or a visa missing. This is the result of equipment worth millions of dollars being used in this field. I have had Printed Circuit Boards produced for me for the past 50 years by different manufacturers and the first boards were hand-etched and hand drilled on paper-bakelite material and cost 20 times more than Elecrow's prices. That's the sort of development and improvement I have seen.