This thread is hilarious! Practically everyone is super serious in explaining that 1) you can use any type of stick, wand, or crutch as a door jam for sliding doors or 2) that 1 of the pictures appears as though the door isn’t installed correctly 
I think the real selling point is the ability to jam a normal door without having to push a piece of furniture in front of it.
Regarding sliding glass doors-This seems useful to deter the casual crime of opportunity. But for the home invasion type of scenario, or breaking into your house while you are gone, a concrete block does a good job of getting through a sliding glass door.
From a best practices standpoint, are you going to brace EVERY exterior door with these EVERY time you go to bed, etc?
Get better doors and locks, cameras, lights, etc…
Hey you don’t know my life. I got nothing but time…
Pushing furniture in front of a door is hilarious! Don’t forget to remove the “sliders” and I highly doubt people are going to push a recliner in front of a door NIGHTLY before going to bed. Maybe you, but not everyone. Nuff said.