I have bought this twice now, and found that it worked really well for both my eyelashes and eyebrows. My eyelashes grew very long - which I loved, but I couldn't justify the cost on an ongoing basis. Unfortunately eyelashes fall out and are replaced fairly often, so once you stop its back to shorter eyelashes pretty fast.
My eyebrows were a different story - I used the serum on the thin areas of brow that I have overplucked over the last few decades. It seemed to kickstart some new growth, which helped my eyebrows thicken up again a bit. Even after stopping, my eyebrows still seem to be growing in those areas. I would repurchase for this reason alone, as I would like to thicken my eyebrows a bit more.
After having eyelash extensions for a year, they ruined my eyelashes. I wanted to try a serum and looked at the reviews. Sure enough, this product absolutely works. It's only been 2.5 weeks and I've noticed a huge change in the growth and length. I was not expecting it to work so quick. Worth buying!
Tips: Apply at night as can make your eyes bloodshot and heavy. Apply on eyebrows too for more growth.