Although I have relatively clear skin, I wear a lot of eye makeup, so I definitely notice the under eye circles I get without any make up on. This cream is AWESOME. After a few uses, you can definitely see the difference.
Sometimes, I do like to going without the makeup (when I'm running errands, etc), but I dab a little of this cream on so that it's working on the go. It's better to use this cream when you aren't planning on wearing makeup, so nighttime is best.
I definitely plan to buy the full size version of this product when it's out, but the little sample I got is has already lasted one month + !!