First of all, AES is a software tool by Aerosoft. I think, it's one of the best addon for the FS family. For me, it's the best ever, because it gives a different taste to the simulator. For more information, you can visit the site of Aerosoft.
The gates attach to the aircraft automatically, if you fly with well-known addon planes. But you can adjust the gates to any plane, thanks to a configuration tool included.
About the scenery; i have no idea, if it's frames-friendly. In my pc (Dual core with a nvidia gtx8800), everything goes smooth. But, it is very-well made and it's an AES supported.
See you.....