That is awesome and I'm glad somebody did it. But was there some reason not to just pull the laptop batteries and use normal remote-controllable outlets?
What happens when someone accidentally does a clean shutdown from within the OS?
Switchable PDUs have the same issue. You need something like Wake-on-LAN in addition to the switchable power to ensure you don't need to do a late night drive into the data center or office.
This is on by default on all server boards and the toggle was on all consumer boards i've tried.