So I bought this adapter as the Ethernet ports are quite far from my pc so thought this would be the best option, as I have virgin media 500mbps. I got it so I could connect to the 5ghz, however, the connection is dreadful. All the drivers have been installed and I've sat here for ages trying to find a fix. I have found something interesting in that when I look at the properties of the network I'm connecting to, it says for link speed (receive and transmit) is at 260mbps. But if I try to get a speed test online, it barely is able to search for a website before it cuts in and out again, and when I finally get to a speed test website, I get 0.42mbps-2mbps. On WiFi on my phone I get 250ish so I have no idea why the adapter is capping itself. 
 

At this point I'm thinking about just returning it and buying a 20 meter Ethernet cable