Definitely worth it! I used it for the full 16 weeks and am now just maintaining by applying Latisse every 3 days. It does leave your eyes bloodshot and somewhat irritated for the first month but that can easily be remedied by using eye drops. They are long, thick and all I need is one coat of mascara. My lashes hit my upper lids. My friends thought I had on fake lashes.
You can stretch the use of a your bottle of Latisse by using a dedicated lip liner (or small cosmetic brush of your choice). I find the applicators it comes with a little harsh.