I will go over what impressed me in AC. The overall polish of the interface. The GUI is very well done. The load times are also incredibly short. 5secs to load the car and track on a traditional hard drive is impressive. The GFX, even on my old 5770 were good. I got good framerates too. But the input lag is totally out of control. After doing some digging I see the menu interface runs under a different process from the actual sim and the UI is actually HTML5. I would love to see ISI break the sim off of the UI. iRacing does this too. People could build some really nice UIs if they switched to HTML5. The current UI is a pain to work with. There are no WYSIWYG editors. You have to do it all in Notepad and do a lot of trial and error. If it was HTML5 we could use any off the shelf tool to build the UI.