I replaced the WLAN card with the Intel 7260 HMW to get 802.11AC without any issues. Just open it from the bottom instead of the top like the service manual shows and it's a <15 minute installation. I don't know what all the fuss is about with this series laptop, it is thin but really not that hard to open up. Also replaced with a Samsung 840 Pro SSD which was a breeze as well. There is practically no way to screw it up since the bottom easily pops off without any ribbons or cables to unhook.