Bought this to exchange a faulty card in my wifes computer. It works like a charm and it was really easy to exchange it using tutorials found online. Only hickup was the delivery to sweden that took longer than expected. But I think that is on the Swedish postal service.
This ac card replaced the stock 'n' wireless card installed in my 2012 MacBook pro retina. With ac capable routers you see a noticeable improvement in wireless speeds. The best aspect of this is when transferring large files between computers on the local network.
Installation was very straightforward. Make sure you have the correct screwdrivers especially 1.2 pentalobe for the case.
It's a good price, it works, it was delivered quickly. I'm pleased I got it. I recommend it.