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So it sounds like the software isn't ready for the 5d mkiii at the moment specially since I only have a Mac. I can run windows on it but the semi-automatic adjustments sounds like it's not accurate. Is this correct?
It's no less accurate, it's just that the software has to prompt you to make changes to the MFA value as it goes along. In automatic mode the software can make the adjustments without your intervention. The final result is however, the same. It's just that, because the MFA process is iterative, the semi-automatic mode is more time consuming.
It's just as accurate - as accurate as you want it to be. The problem is that if you want it to be very accurate, or it's struggling with a lens (in my arsenal, 50L or 28-300) then it will take many many samples and you will find yourself setting many many MA values - and then you may reconsider how accurately you want it done. Trust me, it gets tedious after a while. Then again with 17 lenses, half of them zooms (which require two runs) maybe I have to have more patience than most people.