Many products however set a custom product ID (PID) to differentiate their device, though in the thread some mention that there are driver issues even with the default VID/PID combination. At its core appears to be that the built-in FTDI driver provided by Apple (xt) only supports FTDI chips which provide the standard FTDI vendor and product ID (e.g. An anonymous reader pinged us about an issue that affects people who jumped onto the latest-and-greatest OS from the Apple gardens: USB devices that stop working due to the FTDI-based USB solution.
