Don't listen to the people complaining about the size of the sample bubble pack. I literally got 10 uses out of that tiny bubble. You'd have to slather the product all over your face and neck to get barely 1 use out of it.
When it comes to the actual product, I definitely saw an immediate result, but I ised it before bed and felt like short-term, the effects would wear off slightly by morning. I could see why someone would choose to use this in the morning before applying cosmetics. Long-term, I think this could actually really work on the darkness around my eyes. Not sure if there's any effect on tiny crow's feet, but I didn't really care about those anyway.