The Netgear Nighthawk X4S D7800 looks just about identical to its slightly more powerful and similarly named cousin, the R7800, and the older R7500 before it. It's a black trapezoid with four antennas in a porcupine-like arrangement, with the same pair of USB ports and eSATA port. It adds a few new features though, bringing MU-MIMO wireless, an integrated VDSL modem and 256-QAM over both 802.11n and 802.11ac.