They took time enough, the MLAA (ATI morphological AA) works since day one, I remember post a comparative screenshot in this forum time ago.
Anyway ... Force morphological AA methods by card drivers have performance hit usually because the Nvidia and ATI configurations are set very aggressive to kill every aliasing, they cant afford people saying that this not work
so be aware, may be is why there hit in the text.
And the AA morphological methods ordered by quality is like this :
SMAA >
FXAA >
MLAA
So if i aren't wrong and this method changed drastically in this driver the SMAA method are on the top of the best quality at the morphological AA race.
Personally I´ll stick with the injection mods for long time, if you know how to tweak FXAA and SMAA injection mods you can reach better results and performance.