I've had my two 290xs for a fortnight now, and I honestly cannot complain about crossfire drivers.
With that said, I've been extremely busy so I haven't gamed a lot, and the newest game I've played is DA:I, which I know is particularly well-optimised for AMD cards. But even older stuff which I'd heard was extremely problematic was running flawlessly for me, Witcher 2, Dark Souls II, AC:IV. 60 FPS constantly at 3200x1800
With that said, I've been extremely busy so I haven't gamed a lot, and the newest game I've played is DA:I, which I know is particularly well-optimised for AMD cards. But even older stuff which I'd heard was extremely problematic was running flawlessly for me, Witcher 2, Dark Souls II, AC:IV. 60 FPS constantly at 3200x1800