I've only had mine a week, but the A/C system seems to do a pretty good job cooling the car down in the hot, humid TN heat. Mine is black on black and it was in the mid 90s when I test drove it. Despite sitting in the sun all day, it cooled down quickly once we got going. The fan seemed to have no problem delivering plenty of airflow. Having said that, I will say the air temperature never seemed to feel really cold. This was also the case with my '09 Cadillac CTS, it moved plenty of air and cooled the cabin quickly but never blew really cold air the way my Infiniti or Lincoln did. I'm afraid that is the nature of the newer A/C systems as I also exprienced the same "cool but not cold" air in a Tahoe I had as a rental when on a business trip a few weeks ago. I've also noticed the compressor cycles on and off when idling, even in 90 degree temps. Not a low charge short-cycle, but an occasional click off and then back on. Again, my Cadillac did the same thing as did every one of the loaner Cadillacs I drove(and I drove lots of them while mine was in for service). Whereas the compressor on my Infiniti was always on whenever the A/C was. Same with the Lincoln unless the ambient temps were below 80.
