Buyers should prioritize the mainboard version (e.g., Pandora Box DX, CX, or EX) as this dictates the CPU power, game library size, and emulation accuracy. Ensure the unit supports HDMI and VGA output for modern display compatibility. For the controls, look for Sanwa-style joysticks and microswitch buttons which are rated for at least 5 million clicks to ensure durability in high-traffic environments. Additionally, verify the internal storage capacity (SD card or EMMC) and whether the system supports WiFi for game market downloads and high-score saving.