I'm using the CGA2RGBv2 with a Commodore 128 for its 80-column RGBI port, plugged into an OSSC (Open Source Scan Converter). The picture is emulator-clear - razor sharp and flicker free once OSSC is properly configured. I don't have any 15kHz capable displays, which is why I needed to use CGA2RGBv2 in conjunction with an upscaler. HIGHLY recommend and good documentation on the seller's website https://gglabs.us/
I would have liked an optional pre-made USB-A power cable to be available for an extra charge, but wasn't hard to make once I borrowed the appropriate tools.