This card easily tripled the speed of the Dlink DAP-1650 I was trying to use for the job. I can recommend it.
I get 350Mbps over 50m traveling through ductwork; walls; pipes; and cabinetry to an Apple Time Capsule
Antenna positioning matters and considering the cable length, the antenna base always seems to get bumped; They probably should have put some two-sided tape into the box to help people with installation