At first, the salesperson - David will keep you updated about the quotation, negotiation and payment for the board design you will be sending. Of course you will request a sample order to check their quality and communication. Then the problem starts, he will request you a full payment for the sample order (which is not a problem as its only small amount) but still this should be an issue if you're first time customer. They refused a partial payment as he said it is only small amount (around 800$ for two boards). We took risk and proceed to full payment, he committed us 8 days to make. Eventually, after 3-4 days, he kept on saying that the materials will take long time to import as it is not available in China. So I helped him to check different sources, Alibaba, aliexpress, findchips, etc. and he kept on giving barriers like they don't have credit cards, they tried to talk to this alibaba contacts and kept on saying no materials. So as a customer, I realized that this should not be my responsibility and he keeps on pushing back the problems with no solution. I am fed up dealing with him as he has no proactivene solutions. This is just a communication problem, what more on the board quality?