Yup on the ease of the average person installing a GFCI,,
But as a electrician, i would not use the "strip the insulation,and stick the wire in the hole "way of hooking it up, go the wrap the wire around the screw way(wrap clockwise , so the wire will stay wrapped around the screw as you tighten it, you'll seen very quickly why, if you wrap the other direction)
Not a fan of the "no screw" way of attaching wires to the GFCI's or any outlet for that matter,,one lil piece of spring tension copper,holding the wire at one small point, does not make me feel well about a good, long term connection.
I would never wire one up that way in my home, or anyone elses,,
The "in the hole" way gives you a very small area of wire contact,and trusting that tension to hold over time does not make me feel at ease going that route.
No electrician i know would ever wire up outlets that way,,you can argue the fact that why did they make it that way,,can't give a good answer on that one,,just cuz it's there, don't make it the best way to go,, IMO,,
Sure it's fast and easy,but that's the same way the wire can work loose,fast and easily,,,
Just my professional 2 cents,,,
