Having now used the Phantom 4 and Inspire 1 Pro for mapping Im unsure as to which is the better system. The Phantom is a very quick and easy system to use and is idiot proof. The Inspire is a professional beast with professional lenses which needed the extra attention and set-up to ensure a good finish. Ive used the stock 15mm lens, and also Olympus 12mm, 17mm, and 14-42mm with comparable results. Getting 1.5cm GSD is normal from around 120ft and processing 150-200 images is similar timing for both. Im not seeing any real benefit from the extra resolution of the Inspire 1 Pro and I find that surprising. I wonder what others felt ?