Bought this (and the servo control board) to replace the standard 8-way joystick in my Mayflash F300 fight stick, which I use with RetroPie. The only problem I had with it was that the ring was a little tight and the motor wouldn't switch smoothly from 4-way to 8-way. However, after a small amount of sanding down it works fine and now I can play Pacman and Scramble :)
If you're interested in installing in a Mayflash F300, please note that it's a tight squeeze and needs some modification to the case, some longer bolts and spacers. You will need to find a pair of nuts & bolts to attach the motor as does NOT use the same mounting as the joystick. I also recommend you buy a Crown conversion harness and JST-XH connector cable - this makes attaching to the Mayflash controller board much easier, but still needs some soldering.