This is a great product. To compare, last year I have also used Physician's formula 2 in 1 lash boosting eyeliner, and it worked nothing like this baby right here, because it took me over 2 months of use to really see a small improvement of lash growth. (Don't get me wrong, the PF eyeliner is still a great eyeliner, just maybe not as effective in lash growth). Now for the l'oreal version: after less than a week of usage, I can already notice a different in my lashes. This is because I have asian lashes that are extremely short, to the extent that i have difficulty using a lash curler since it often picks up only a tiny bit. But now I can really tell the difference between how much eyelashes I have left each time when I squeeze my lash curler. Its crazy! The price is reasonable as well.