Well, it works fine much of the time for me. It is BETA, people still can't wrap their arms around that. I'm not disappointed at all because now that I've seen the performance increase with a 4770k/280x, it is more than expected. If it doesn't get patched right away and the game isn't stable, NO PROBLEM; simply turn Mantle off and wait for solutions/patches. Or, rollback to older drivers. This isn't anything out of the ordinary. Again, it is BETA, always keep that in mind.