If you use them everyday without fail, they definitely work after awhile

The difference is much more noticeable when you apply mascara. I think it is essential in everyone's regime. I tried Stimulash fushion from Sephora (very pricy, won't repurchase), the Silk Naturals one (very cheap), and currently using an Asian one that my mommy gave me. If anyone wants to try it out, I suggest going for the cheaper ones first. I don't see a need to buy the more expensive ones. They don't seem to work any better than the cheaper ones. Don't expect crazy false lashes in a matter of days though. I get more thicker lashes, more abundance of lashes, and faster growth. I wonder if biotin helps too? I would love the try to MAC version if it isn't super expensive. Nonetheless, I don't find myself needing to pile on mascara like I used to do before I used lash serums.