the Flight Model used in Take On Helicopters is N times complex and better in simulation than the one used in ARMA 2: OA

http://takeonthegame.com/technology-checklist/

Already bought the game (from Steam). It is more realistic than ARMA2. You can also do manual startup proceedures. Difficulty is scalable so you can use ARMA-level or Simulation-level flight mechanics. I'm not too good with helicopters so I turn Auto-trim on. Other stuff I keep realistic. Because of the game is mission based, I also turned on-screen mission info and HUD.

My impression in my blog:

http://jomnisgames.blogspot.com/2011/10/take-on-helicopters.html