After 19 days of ordering, I received 5 PCBs safely. However, it is relatively good delivery considering the shipment from England to South Korea by ordinary mail. And it is very useful with few products that can test xmega-A4U series. The quality of the PCB was good and the parts to be assembled were readily available. Thank you very much. I'll buy it again if necessary.
It can be difficult to get a really small dev board for STM32. This one fit the bill. It has the actual minimum feature set (nRST and BOOT0 buttons, one LED) and a complete set of test points for the MCU. My project was complete in a couple of hours.