I, like a lot of people, think that borderless windowed is vastly superior to exclusive fullscreen. You can multitask without worrying about your game crashing, use second monitors, resize the window if you want, all sorts of things. One of the games I play, ESO, didn't even have exclusive fullscreen when it came out (and it still doesn't for D3D9). SLI supports windowed modes, why does CrossFire still lack in this department? It's very frustrating!