I converted my house to the new 802.11AC standard and it is a lot faster. It speeds up file transfers and the Internet connection IF the network was slowing it down.
I bought 3 USB adapters when I switched over and only used one on them so far. Have upgraded the computer internals so don't need two of them.
Brand New and in the shrink wrap still
Here is an Ad on Amazon for the same thing
On Amazon they are $36 a piece or $72. I'll take $50 for the pair - SOLD