Invisible trim nail/screw

[Tomainen]

Has anyone tested and can give a review on whether these work? Invisible listspik and skruv. I've seen them on some Chinese sites and they sometimes appear in my Facebook feed..

 

[Mats-S]

Crown molding; no chance of getting it to sit nicely against the wall/ceiling and miter.
Baseboard; possibly as the floor is completely flat and the baseboard doesn't need to be pressed down. Trouble getting outside corners looking nice.

Personally, I would never use them, but maybe that's because I'm an old carpenter who perhaps thinks that a regular wire nail works excellently for nailing moldings. ;-)