Liftoff: FPV Drone Racing is a very good simulator and it just got that little bit better, with update 1.4.0 out now bringing some major improvements.
Going back to the drawing board for the physics system, LuGus Studios decided to rely less on Unity's built-in physics with their new flight controller, the result is that overall in many places it should perform better. Something that also sounds fancy is a new " A.I. PID tune feature" that will adjust "itself based on the system's performance for a perfectly tuned setup in light" but you can still tune things manually.
They also upgraded the Unity version used, added a new environment with three tracks and quite a bit more.
Check out their short video on the new racing environment:
The most recent user reviews are looking good too giving it an Overwhelmingly Positive score and a Very Positive score overall. Seems like plenty of people enjoy this one!
You can buy Liftoff: FPV Drone Racing on Steam.