Phantom (1st gen. with velcro’d telemetry card that only worked occasionally), Inspire (the most amazing drone but sold all the batteries with the backup I1), Mavic 2 pro, Mavic 2 Enterprise advanced (now sold, only purchased for a specific job)...
In CANADA before 2019, you had to obtain an SFOC (special flight operations certificate, similar requirement for flying a manned home built airplane) to fly in controlled airspace (D, C and E) typically 65 pages, followed by about a month wait...
Small point, limited applicability, you can stitch plan views of an area with a flat surface. I did the floor of a commercial building that had a fancy tile colouring arrangement with multiple plan views using Photoshop, it also worked with...
I have a Mavic 2 pro that I no longer use. The batteries were all down to 90% life and all cycled down to zero and full recharged to maintain balanced cells frequently. I’d say well maintained. But in very cold weather I saw scary cell deviation...