Just be prepared, as i have learned in the demo, to fly real time sorties.
It is very reality based, if you don't keep the stukas, you are escorting in a mission, in view you might miss the enemy fighters attacking them.
So you return after 45 min. troubleless flying without sighting a enemy but having lost almost all stukas.
You also learn to close your radiators in cruise flight because the oil will go below 30°C in the 109 with open oil-cooler.
I found the missions very immersive!