My son has recently purchased a DJI Mavic Mini which is an amazing (to me) piece of kit. The tech in terms of aeronautics, battery, range and electronics, camera and gimble are fantastic for a device this size.
I've read the rules and they all seem reasonable to me except the line of sight bit. The Mini is so small that it is easily lost in the background sky at say 30-40 metres. This on a device that has a range of kilometers.