The Aussie Hair Insurance Split End Protector works well for damaged hair by helping smooth and protect the ends from further breakage. Its efficacy is noticeable after a few uses because it makes hair feel softer and look healthier while reducing the appearance of split ends. The performance is good since a small amount goes a long way and it doesn't feel heavy on the hair. While it doesn't truly repair split ends, it helps restore the look of dry or damaged hair and keeps it manageable. The smell is pleasant and slightly floral, leaving the hair fresh after application.