I cannot count the number of times I have been failing to fix something, sweating profusely, and cursing sotto voce, when my attempt was stopped dead in it's tracks by a stripped fastener. Particularly when a hardened screw or bolt is threaded into softer aluminum, and hard to reach, it can take days to get past one screwed up screw.
So, this is better than gold for those of us that try to get stuff done.
Imma point out I have no interest in this product, nor get any kind of fee or anything. It's just a lifesaver, and I wanted to share.