Dapu is Japanese-owned and (very likely) made in China like everything else. Their homepage has office address in Shanghai, China and says "factories in Japan, Vietnam, China".
Most people are familiar with their hubs, not mid drives.
On a brief glance, Dapu 250W mid drive is very heavy - twice heavier than Bosch 250 or Bafang 250, and is throttle-compatible same as Bafang (while Bosch is not). Dapu don't make mid drives bigger than 250W.
If I were in a market for a mid drive, I would consider Bafang 250 (or, possibly, 500) before Dapu 250, because of lower price, weight, and better availability.
If I had a little more money and was ready to give up a throttle, I would buy Bosch - higher initial investment, higher cost of replacement (not just motor but battery as well), and superb track record.
Though, most likley, I would've just stayed with a hub