Pretty good. DCS:World free on Steam with one or two good aircraft. Then it's buy which ever aircraft you like. I got a Russian attack helicopter. It's currently half price at $35 on Steam.
Hi mate, not sure if it’s a dyslexic thing, but the Sim is called ‘DCS’ (Digital Combat Simulator) and last time I checked is all based around a base product called ‘DCS:World’.
Each module is pretty expensive, but that usually pales in comparison to the commitment needed to learn the interface and respective airframe(s).
A good attack helicopter flight sim for $35. Base game (DCS:World) is free.