Although “7 Gigabit performance” makes for great headlines, the real advance of 802.11ac will be better throughput for more clients. As we move to 5 GHz, 802.11ac will support more simultaneous client connections with MIMO stability. Although performance will improve to 400+ Mbps, users will likely never see multi-gigabit throughput.
Buyers of 802.11n wireless network equipment should not assume they will see a great benefit right out of the box. Most will have to enable by hand a high-performance configuration including wide channels and 5 GHz operation. And some client devices may never reach the levels of performance expected by consumers due to hardware limitations.