Coming from a manufacturing background I understand that in China manufacturing is a communal effort meaning larger factories contract their work out to other firms. The cigar industry in Cuba is the same, the same brand of cigar can be made at several factories, it doesn't mean they are fakes, but the quality is not the same from factory to factory.
From what I can see the manual soldering workmanship is horrible on all of them, look at the two point of solder on the HDMI connector and the WiFi wire, just blobs of solder not even properly wetted. Most of the time when I buy electronics, I have to take them all apart, deflux the whole PCB and retouch all the solder points to IPC-A610 Class 2 or Class 3 standards ! With the extensive use of BGA components such as the memory chips, these high volume low cost assemblies do not go through X-Ray to verifiy if all the balls have been properly wetted onto the PCB.
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