“This is a decent part and works well. Seems to be an unusual height as I didn't have a standoff of the right height. Still very useful and has a decent fit into the hat I am using.”
“The stacking header allows you to “stack” multiple hats on top of a Pi, or if you use the stacking header on a Pi Zero, you can use it has a plug-in compute module and still plug a HAT into it.”
“Cheap and handy addition for access to pins in low profile case, but most useful in a higher sided case as access is more difficult without, but you need to cut out the top if using a PiDrive case from WD.”