Second pic shows a
Feed through method?

Since I always pigtail outlets, I have to ask does anybody use this "feed through" method on a 20A circuit? If the device is rated at 15A, what now is the remainder of the circuit rated?

I beleive this creates a weak link for downstream loads.

The tool seems to be geared toward the "Working Hot" issue. Looks like a good gadget for replacment purposes, if you have to work it hot.