Effortless cables of all lengths. The construction of the jack pieces is excellent. Making straight-end cables is super fast, and it is only a little more fiddly to set them angled. I got these partly just for board planning, and it's great to just experiment with different neat setups without having to commit to soldering a cable. Even now that I'm ready to set and forget my board, I see no reason to replace some of the cables I've made as I am getting no noise at all and no noticeable degradation in signal.
In fact, I will order another set of these just so that I have a load of spares for any time I need to experiment or just make a fast replacement cable if a soldered cable fails.
I'm very pleased and see no cons.