From a long drawn out fight with a bad company, I ended up with two S9's. One I have been using for about 5 to 6 weeks and the other arrived last week. I hooked up the No 2 unit and added the same software file. Did some scans and discovered it does not or can not pick up half of what the No 1 unit can. Same S9, same units, but very different. Is this a case of them being manufactured by many different companies in China?