This kit is amazing! The shampoo is concentrated, so this bottle just keeps going and going and going... The conditioner is truly a deep conditioning treatment, but it also rinses completely clean, so there's no gunky residue to start your styling with. The Prep and Protect spray is perfect for my very fine, tangle-prone hair. No greasiness or added weight, just protection from my blow drier and round brush! I'll be honest, I didn't try the oil, because, as I mentioned, I have very fine hair and I'm a little afraid of any oil treatments/products.