My hair background
My hair is pretty damaged from the years of dyeing I've done to it. I have only used drugstore dyes. The last two brands of dyes I used were by Revlon Colorsilk (Burgundy, Auburn) and L'oreal Feria's Ombré kit. As Revlon Colorsilk's dyes contain no ammonia, less damage is done to the hair, but this also means more difficulty in lifting the colour.
When washing your red-dyed hair, it's common, yet unfortunate, to see your sink water becoming reddish because it means your dye is being washed out. This was very apparent to me when I would wash my hair with warm or hot water, or with select shampoos I used such as Tsubaki Shining shampoo with Natural Tsubaki Oil (the red bottle). It made me so sad because I felt like I just killed my hair even more for nothing!
Verdict, Comparisons
Vidal Sassoon's products not only kept shine and moisture to my hair, but it in fact helped with colour preservation. A downside to these products is they do contain sulfate. Sulfate helps with easier lathering to hair, but is also known to be harsh for hair. The next downside, the function of a shampoo itself--- to clean. Compared to my favourite shampoo brand Organix, the VS shampoo does not clean as well as Organix, as my hair gets oily faster. I've previously tried L'oreal's EverPure Sulfate-Free Color Care System (moisture shampoo & conditioner) and I've used it twice only... Because it made my hair extremely dry! Never again :/ Overall, I do enjoy this product because it gets its job done at a reasonable cost for such a big bottle.