My wife have a thirsty wavy/curly type of hair which is coloured every 5 weeks. Because of that, we dicided that she need an extra step to keep her tresses silky soft and healthy. This custom made leave-in treatment is amazing! Not only it has all properties her hair needs, it also smells divine! I don't want to praise it too much. I've recommended it to everyone I know.
These personalized products honestly seem like marketing, TBH. Being in supply chain biz, I don't know how it would be possible to truly customize by person. They probably have a good variety of different product SKUs and slap a name on the bottle & send it as "customized."