The battle immersion only is surpassed by SBP, imo, but the system complexity of avioncis is second to none.
If you use a widescreen, note that replacement cockpits for widescreen are (commercially) available. They are very, very good, and much more detailed.
Be careful that you pick the right versions.
http://www.cockpits.nl/
Since there are three versions of the Viper in Allied Force, you need a different pit for each of them. It costed me money - but I did not regret it.
the Hi Tiles also are recommended.
http://www.hitiles.com/indexF4AF.htm