buddy has a dji phantom 4, I raced it in a quarter mile on a scooter that tops out at 80 mph... barely beat it.
True, it can go a little over 45 but it accelerates a lot faster than my scooter. I was probably doing 70 when i crossed the finish line. I have the video somewhere, I'll see if i can post it somehow... *edit: put the video on photobucket but can't embed it here apparently.
My friend has a surveying company and only uses drones. The cameras and sensors are amazing. Add into that the software and you have an incredible resouce. We used it on the golf course with lidar for a 3d model. Next year were hoping ground penetrating radar is available for it so we can see exactly where our irrigation lines are.
I have the Mavic. Fun little fucker, although I crashed it trying to use tripod mode indoors, which they advertised it being good for. They're sending me a replacement. I also have a nano qx which is small and perfect for indoors while we get shit on with snow and below freezing weather here.