I have the Sapphire FLEX series 6950 card. FLEX means its specially designed for Eyefinity. Have it about 3 months so far and its been working great. Crysis 2, Shogun 2, Dirt 3, GTA 4 w/ boatloads of mods, BFBC2, etc. Setup was real easy too.
^oh, so you have played crysis 2 in eyefinity in dx11? it doesnt even run like butter on a single 1080p monitor, let alone 3. There are a few other games that would struggle also. Im sure it would run some games fine, but not all, and not at max detail settings.