I've been using this for around 6 weeks. I've used about 1/4 of the bottle. It's difficult to apply because my dropper immediately broke. It wouldn't suck up the fluid. I look closely at it and the white ring inside the lid that holds the dropper in place is disintegrating. The rubber is literally falling apart. There are pieces floating in the bottle. So there is no airtight hold in order for the dropper to suck up any fluid.
Needless to say, I'm not impressed with the packaging. Trying to get the watery fluid on your face is difficult.
I haven't noticed any improvement in my fine lines however my face feels smooth. There is no stinging and the fluid soaks in immediately. I'll continue to use up the bottle (you do get a lot for the money) and unless I see any improvement, I wouldn't purchase again.