It states "this unit will automatically determine the on and off power level of any desktop computer or hi-fi audio visual amplifier to automatically switch power to peripheral equipment only when in use."
Now that I think about it, my best mate bought one to use with some TV units and associated Sky boxe and DVD player.....
I have one of those, hit the front panel switch on the PC and 5 seconds after it's shutdown, all the other devices are switched off. No need to turn off the PSU switch at the back. Power the PC up with the front switch and everything else powers up too, very handy device. My PC is set to switch off from the front panel power button, not sleep or hibernate.
My computers are shut down via the screen. No button pressing required (apart from the mouse). I then switch off the switch block/surge protector and everything else then shuts down. Don't most people do it like that?
I never use the main button on the computer to shut down, only to start up.