Energy saver

[ppppenguin]

As others have said, domestic users are not charged for Volt-Amps reactive (VARs) so no point in power factor correction. As Nick has pointed out, modern appliances have to have a decent PF to comply with regs. What's a bit more iffy is harmonics. The current waveform drawn by a PFC corrected PSU will still be full of harmonics, it's typically a spike of current at the same phase as the voltage peak. I have no idea how domestic metering responds to harmonics, probably it doesn't or it's negligible. The effect on the network as a whole can be significant. Takes you back to the old days of lots of TVs with half wave rectification causing significant distortion of the mains waveform.

Back to the OP. The device is pure snake oil.