I used Latisse for 2 years and have to say that it did what it said, my eyelashes were incredibly long, thicker, and darker.
I had two problems:
1. my eyes were red on the lids and had to be covered with concealer.
2. My brown eyes became about two times darker than their normal color. My husband commented that he didn't like the color change in my eyes, and he said that they appeared to be duller and lifeless. I stopped using it immediately. If you have blue eyes be very careful regarding the color change as it cannot be reversed.