I noticed results right away and my fine lines became much smoother. My skin also became a bit brighter and radiant. However, although I use it every night, it doesn't seem to keep improving, if that makes sense. It's a little like how a type of shampoo will work well and then you have to use a different kind to get good results again.
I bought it because of the guarantee, so it's definitely not a gamble or waste of money.