I'm planning to build an arcade cabinet and I didn't want to use the off-the-shelf USB arcade controllers. Instead I wanted a little more customization and control over what I was building. Using the Arduino Pro Micro (clone), and the code here: https://github.com/MHeironimus/ArduinoJoystickLibrary I was able to create exactly what I wanted. And this little breakout board with screw terminals is perfect for my application. I ordered the fully assembled boards (2) and received both the fully assembled v0.6 and the bare board v0.5 boards (as a surprise bonus). Great price, nice design. Very happy with my purchase!