X73S is an upgraded version of X73 Mini Indoor FPV racing Quadcopter. X73S now has brushless setup, F3 Flight controller running Betaflight, and 10000kv Brushless motors spinning mini 4 blade propellers. X73S offers superb flight characteristics, power, speed and flight endurance. It’s a good indoor Mini FPV Racing Quadcopter which could have been even better if they paid attention to quality control. There are still some quality issues but there are easy solutions to those. X73S comes BNF to various radio systems and is super easy to setup. Flight performance is superb and It will take some beating with smile given that you have installed some DIY Protection to antennas, and other weaker areas. X73S is fast, and a super fun quadcopter to fly indoor FPV Proximity and indoor FPV Racing. Betaflight comes preset to good PIDs too.