Just to further muddy the water....
Wago (the name of the manufacturer) is now making a similar type connector that has little levers to grip the wires. That is, you can actually remove wires .. a real plus!
I agree that these things (both types) really shine when there are more than four wires to connect, or when the wires are of differing sizes.
BTW, please do not post using all caps! All caps is a lot harder to read.
As far as receptacle connections are concerned, most of the "back stab" failures I've seen have had lots of problems somewhere inside the device. For example, the two receptacles will give different readings on a plug-in tester. I cannot say this is the fault of the 'back-stab,' and might actually be caused by something else inside the POS device. At least, when you use the screws you eliminate the inside device from the list of things that can go wrong.
