Fantastic stuff! I have overprocessed hair (permed, coloured, straightened, you name it!) and this really sorted all that out with just one treatment. Bought it as an alternative to signing up for a package of hair spa treatments, which would have cost way more than this product. After just one use, my hair felt stronger, fuller and was definitely shinier. The salon I bought this from told me the effects could last up to 4 weeks and initially I was sceptical but IT REALLY DID! Yes, it's crazy expensive but I'd definitely bite the bullet and repurchase. P.S. ladies sensitive to scent may want to avoid this product - it has a very strong fragrance. By no means unpleasant (it does smell 'expensive' like others have pointed out!), but if you're sensitive, this could be an issue.