I live 35mi from their Carson,CA facility, so ground shipping is overnight to DJI from my house. My P4 was exchanged in 9 days (including shipping both ways), however it took me 10 days to initially get the RMA and shipping label, proving my case with flight logs and video to match. I was happy with their service response time, but they didn't do anything to fix my weak controller to get to perform like my P3P (GL300A) which can go 3mi and the P4 (GL300C) less than 1mi. They exchanged the P4 craft to fix a problem with YOYOing, but didn't exchange the controller, apparently because it's perfect fine, to their standard. WEAK. I'm happy with my P4 using the GL658A controller.