One more note on what I learned when I had both a true MCE remote and a knockoff one:
The true MCE remote (Anyware HA-IR01SV) only got activated when Windows was up and running or in S3 state. The knockoff did not need Windows at all. For instance, I was able to use the knockoff remote to select the Windows boot menu (I had a multboot setup) whereas the true MCE remote wasn't even powered on at the boot menu. I vaguely remember I was also able to use the knockoff remote in the BIOS.
I think these knockoff remotes are more versatile than a true MCE remote provided that you don't need to wake from S3 functionality.
Come to think of it, maybe the wake from S3 functionality was disabled deliberately on these knockoff remotes because if it wasn't, pressing any button would generate a USB event that would wake up the PC, a behavior that we may find desirable but may not be MCE remote compliant.