The R720 is the highest-capacity four-stream 802.11ac Wave 2 AP with four streams of MU-MIMO connectivity, it can simultaneously transmit to multiple Wave 2 clients in the widest available channels, drastically improving RF efficiency.  And with support for multi-gigabit 2.5 GbE, you can more than double your backhaul capacity without having to add switch ports or run new Ethernet cabling.