Summering: Has only been running for a day but about as simple an install as you can imagine. Took about 5 minutes to put in a tower in a back bedroom to eliminate an ethernet cable snaking through the hallway. Windows 8.1 recognized and loaded drivers in moments.
Summering: Cheapest PCIe Wifi card I've been able to find. It works great out of the box with Windows; it's essentially plug-and-play. I haven't tried it on any other operating systems, so I can't speak for that.