I have just upgraded my router to the Asus AC3200. My MacBook Pro with Retina only had N WiFi card and I was getting about 50 MB / sec ( yes MegaByte ) on local file copy transfers. Once I purchased the new AC card and installed it I am now able to copy at OVER 90Mb / sec. Not only did it make a difference it almost DOUBLED my speed over wifi. I now have Gigabit speed over WiFi. So I can verify that this upgrade IS worth it.