Well, I received mines as well (coming from AK audio store), ordered at the 7th Anniversary sale. The pair actually got shipped ~7th of April, same as most of the other people who ordered from different stores during the sale (so I guess it must be from the same batch). OOTB they don't sound bad, compared to the **** 4in1, though I'm experiencing the same issue with cutting-out on the left earpiece. Strangely enough its present with the original mic cable and the cable from my ****, but not with the other cable the K3 Pro came with (I know it sounds extremely strange). No problems with the right earpiece though...
Someone mentioned that his pair seemed not balanced correctly (right one is louder than the left one)... and I kinda feel like I'm experiencing the same. According to the person that initially reported this, it was caused by the driver mountings not being symmetrical. Mines seem symmetrical though, so am not sure if I'm imagining stuff, or they are really unbalanced. And to be honest, I don't know exactly how to test that, so I'm 100% sure.
Build quality seems decent, so definitely don't wanna try disassembling them to check if they came with original or fake 30017.
Overall expected A LOT MORE than what I got. Not sure how to handle the QC issues ... should I contact AK Audio Store, cause I definitely don't wanna pay for shipping them back to China.