I took this straight out of the bag and for a quick test hooked it up to a FTDI 3.3v TTL to USB serial converter and plugged in a USB keyboard and a wireless mouse, I monitored the inputs on a terminal program and could quickly see I was getting the correct data from both devices.
I am extremely pleased with this purchase, the people at MatzElectronics are super efficient and great at communications for these three things alone they deserve 5 stars.
I can make headway quite well with the provided github link but if anyone has links to more examples using this product I will certainly check them out.
Really found this to be super easy to use, I was up and running with grabbing USB HID information from my mouse in a matter of minutes with the source code examples and easy to connect device. Highly recommended, definitely don't think twice about grabbing one of these if you need to get input from a usb device, it's a no brainer!
Works exactly as described, just make sure you wire it up correctly (I mistakenly connected TX to TX0 and RX to RX1 on my Arduino). Luckily, the seller has amazing support and quick response times, and helped me troubleshoot my issue. Would definitely buy this product again!