After having WIFI performance issues at the back end of my house with Kodi on my Google TV and my RaspberryPi 4 I decided to bust out my Rpi2 with this adapter. This solved all of the performance issues that I was having.
I can't say for sure what brought on the performance issues. Either my router degraded in some fashion or there is too much radio interference near my house now.
The Techkey-6B06 is a beast. Get one if you find it on sale like I did.
I'll try to roll a RPi4 image with the driver and see how that performs too.