ASUS RT-AC66U review: enhanced RT-N66U
 

If you need outstanding performance on the 802.11n standard and you aren't at all interested in 802.11ac, then we would recommend saving some money and buying the RT-N66U instead of the new RT-AC66U. ASUS has proven that the hardware works, just not always to its full potential. The performance of the RT-AC66U on 802.11n is good, but not quite on the level of the RT-N66U. If you do already want an 802.11ac router and also take advantage of the best performance, then based on our tests the best option is to buy an ASUS RT-AC66U and a Netgear R6300 as bridge.

http://uk.hardware.info/reviews/3216...hanced-rt-n66u