I used it a couple of times, but for obvious reasons, didn't notice any difference. It's hard to judge a product that requires long-term use by a sample size. I will say that there was no strong odor or fragrance, it did not break me out, and it absorbed into my skin quickly. I can't stand when a product just leaves you feeling greasy because it won't sink in!
In general, I do love Philosophy products but I don't think I'll be purchasing the full size of the Full of Promise Treatment because I don't feel it is worth $75 for 1 oz of product. Also, I have about 10 other serums I need to finish up first before I go out and buy any more!
Do you have a favorite Philosophy product?