You'll want additional batteries; you get about 25 minutes per battery. The device has no collision avoidance sensors which means you could unintentionally fly it into obstructions or obstacles. But, this could be an advantage if you're careful in that you can get closer to a certain point that DJI's Mavic will allow before Mavic's sensors stop any forward flight. But to me, the risk of possibly crashing into something due to a lack of collision avoidance sensors makes spending a couple hundred dollars more on the Mavic makes sense. Yes, it's $200 more or so, but flying into something & crashing for lack of sensors means you're out the full $800 of the Anafi. So it's a cost-benefit risk you take. Also, remember if you're inspecting roofs you're flying in a commercial capacity & you will need to obtain your FAA Part 107 flight certification.