Liftoff is another RC Quadcopter Racing Simulator.
It can be purchased through Steam: http://store.steampowered.com/app/410340/
This simulator is developed by LuGus Studios and drone manufacturers ImmersionRC and FatShark.
This review is purely focussed on the FEEL of flight in relation to real life piloting of a multirotor quadcopter.
The FEEL of flight in Liftoff is actually pretty good, however it's important to ensure that you set up the physics and the flight controller settings to ensure you get the most realistic flight characteristics.
There is an entire discussion on the Steam Liftoff forums dedicated to "Acro PIDS" which I highly recommend reading if you are setting up this simulator: http://steamcommunity.com/app/410340/discussions/0/458605613410105625/
Happy Flying!
