I've only just started using this eye serum and I'm super impressed. The lightweight formula is easily spreadable, so you only need to use a tiny amount, and it absorbs really quickly. I've only been using it AM and PM for a few days, and I've already noticed my fine lines under my eyes are reduced, and I've noticed a difference in my dark circles too! It's almost like it instantly refines the area, making it look brighter or something? Will definitely repurchase this one (although this bottle will last me ages!).