5 years ago I built my first quadcopters. They flew, they were fast, they had video transmission – but what I didn’t manage with the little time I had was to built one that hovers perfectly still like the DJI drones did. Flow-sensors were pretty expensive and the cheap ESCs and motors in my small drones were probably not accurate enough anyway to allow stabilisation with a imple PID-controller running on an Atmega microcontroller. So after searching for a hand-luggage portable photography drone for years, in november 2019 the DJI mavic mini hit the market. Unfortunately that was during and not before my southeast-asia holiday so there was no rush to get it (and it was sold out anyway).
Long story short, I bought one in february, flew in Dortmund and took the drone to see waves in Costa Rica =) . Pics below ^^