USB adapter for WiFi 802.11AC, 1000Mbps or better?

[N-OS X-tasy!]

Filliam H. Muffman wrote:
Remember that the speed in the product number is the sum of the 2.5 GHz and 5.0 GHz bands. Subtract the 2.5 GHz speed (400 to 466 Mbps), then cut the 5 GHz speed number in half to get an approximate real world speed.

1200 Mbps - 400 Mbps = 800 Mbps

800 Mbps ÷ 2 = 400 Mbps real world speed.

Not only this, but 802.11ac speeds tend to drop off quickly the farther away the client is from the source, especially on the 5 GHz band.