Hello, I used both "Sintech" and "Chenyang" adapters. I bought mostly "sintech" because they have lots in stock and they're cheaper. In my tests I can't see any difference between both adapters. What made a difference was, again, to put kapton tape at the back of the adapter so that the signal isn't too close to the shield of the Apple MLB 12+16 connector (either this would produce a short circuit or unwanted capacitance). Here is a photo of both adapters... I just noticed the "chenyand" has a solder join between two pins, this seems to be normal... I checked with a multimeter between the same pins on the "Sintech" adapter and they are also connected (0.20 ohms between 2 pins).