Well my overall impression so far is a bit negative I must say. The performance certainly isn't there. My SLI usage is terrible, with both cards getting in the 30s and 40s on average.. I'm thinking I might try to disable SLI and use my other GTX 980 as a dedicated PhysX card..
Frame rate wise, the game plays smooth for the most part, but it's obviously nowhere near 60 FPS even with the frame rate limit removed.
I have everything on maxed settings, Gameworks included. One thing too, is that this game uses a TON of RAM. It uses all of my VRAM, but the RAM usage is very high. I clocked a little over 8GB during the Batmobile chase.. So now is the time to upgrade to 16GB if you haven't done so already.
One good thing, is that I haven't seen the slightest stuttering, even during the car chases. That's something I feared was going to happen given that the game uses Unreal Engine 3.5, or a variant of it.
And man, I hate the film grain effect! Is there any way to turn that shit off?