Back in the day this game was the Falcon 4.0 of combat helicopter sims. It is still well worth the buy. While this may not be the study sim that DCS: Black Shark is, it will still test you and push you to the limit. Once you install this game, head over to this link, http://simhq.com/forum/ubbthreads.php/topics/4234430/eech-ver1-16-0-is-out#Post4234430 , and download the mod. It adds more campaigns, flyable helos, and TrackIR support.
Played this back on the old X-Box. It was a challenge and a lot of fun. You will learn something so the next time you're playing ArmA and someone calls bounding overwatch or something along that line you'll know what they mean. Suppress and flank is the name of the game. Caution is the watchword. You have to think about your tactics, analyze the situation, and develop a plan of attack using both fireteams.