Hello
I had a problem with this adapter when I bought it, 5GHz speed is way too slow 2-3 Mbps, lets say compared to 50-60 Mbps on 2.4GHz. That didn't bothered me that much at the moment (but I bought it specially for using 5GHz network, waited for newer drivers).

And the new problem from today, I update my driver and that totally broke everything. I'm using Windows 10 x64, latest updates. When I rollback the driver, 2.4GHz worked again, but after that I decided to uninstall all tp-link drivers and try my luck with windows  generic one (because I also saw there was no miracast and wondered if it is from the drivers). Then it became worst and I had to do a restore from recent system restore point.