I've only been using this cuticle oil for about a week now, so I can't speak to how well it helps nail-breakage. But I don't have a single hangnail, and for me, that's amazing. I work in a kitchen and my hands just get destroyed every day, and my cuticles are normally torn up, with skin hanging every which way.
I've been leaving the applicator on a table next to my couch so I remember to apply it every night when I get home from work, (because the couch is the first place this tukus goes once I've removed my shoes and my bra) and there has been a significant improvement in their appearance. I'm definitely going to keep using this for a few months to see if it helps them keep some of their strength so I can grow them longer.