This works very well and as described. A very useful and impressive keystroke injection device!
I got this and was having a lot of fun with it, when a change to config.txt bricked it. I contacted Krakrukra, and he concluded it was an error in the firmware. He immediately fixed the issue, sent me a new unit, and even linked me to the documentation on how to flash the fixed firmware to my bricked device. By following the instructions, I was able to restore functionality to the original device. I'm extremely happy with the support!
Shipping was pretty good coming from Russia to the USA, only taking 2-3 weeks.