Re: Airport Extreme performance for my 2011 MacBook pro
Sort of true. Only 2013 macs and iPhone 6/6+ and he latest iPads support wifi ac, so only those will get the highest speeds.
So what you should get depends on your current wifi router. If it supports wireless n, then I would do nothing. If it only supports wireless a/b/g, then you would definitely benefit by getting a new router. In that case assuming you plan on holding on to your MacBook for a while longer, I'd look for a previous generation AirPort Extreme which should cost less and supports the wireless n standard. If you plan on getting a new computer in the new year or so, is go ahead and get the newest AirPort Extreme so that when you get a new computer you will have the fastest wifi.