I am completely satisfied with the growth of fluid. It may initially in use cause reddened eyes, but this lies down again after a few hours. My eyelashes were super long after 3-4 weeks. Its use is very simple, compact the vial. For me, however, the lashes are slightly "unruly" become, in other words, during the eyelash mascara I need more time, since I only "straighten" must partially. My only criticism is the price. 64 Euro for 4 ml is much more. The serum is quickly consumed. It save for later times is not because the serum dries up in the vial.