Just downloaded the demo for XP11. AFFS2 just blows it out of the water. I tried the ASK21, and its all just jerky and not really believable.
Really Ipacs team. If you get nav and systems done for 80% and some basic ATC, you will be the winner of the game for the next couple of years.
Although I personally would like to see some extra gliding orientation (maybe the Bohemia way, make a gliders DLC which can give you a couple of airplanes, better thermals etc.)