I just upgraded my wifi card from my MacBook Pro (Retina, Mid 2012). And I love it. Wifi AC and unlock with Apple Watch worked out of the box. Also the upgrade process is easy to do and you have a reason to finally clean the inside of your mac.
(I put off upgrading because of keyboard issues, and now with the new "Apple Silicon" coming, plus, the machine is great-- I did replace the battery at one point but other than that it's been completely solid.)
https://www.ifixit.com/Answers/View/147393/Can+I+use+its+802...