Real world tests at 400-500 megabits. Sebastian Anthony at Extremetech tested the Linksys 1900/Quantenna getting 449 Mbps, as you can see in the picture at right. Reviewers at Amazon tested at similar speeds. Swisscom and several cable guys are very happy with the Quantenna chips; anecdotally, 9 times out of 10 Quantenna-based gateways connect the whole house at TV speeds. The full rated speed of 1.3 gigabits is actually possible if you have two of these units connected with 4 antennas each and the right environment. Update 2/23 John Cioffi reminds me that .ac achieves the highest speeds by using 160 MHz. In any crowded environment, that won't be possible.