I recently built a rig for a good friend. It used an X-Arcade Tank Stick and an Amazon certified refurbished Dell Optiplex connected to TV via a 25 foot HDMI cable. As well as running latest MAME with 60hz sync refresh support and Daphne with HD versions, it features all the third generation consoles which all tend to work well with Arcade Controls. I also added ColecoVision as he had an Adam as a kid.
Certainly not the best feature in GameEx although it does provide games out of the box. GameEx Arcade is now working again since Flash was removed from Windows thanks to the Ruffle emulator.