This here is the reformulated Advanced Night Repair by Estee Lauder. However, for me, nothing much seems to have changed. It's only slightly thinner than the original.

This serum helps hydrate your skin as well as repair any damage that may have been done. I find that it is brilliant at healing any spot scars I may have as well as evening out the texture of my skin.

I tend to use the only ever so often as sometimes I find that if I use it too regularly then I begin to break out.

Overall though, this product is definitely worth the hype. Give it a try if you can and tell me in the comments if you know of any cheaper alternatives...