It works wonderfully well! It does take about 3-4 weeks to see results.
I used Rodan & Fields Lash Boost for a year or so, loved it, but didn't love the $135 price tag. So I looked for options, this really works well.
I don't love the application brush, the bristles need to be fuller so it can be applied in 1 swipe, so 2 swipes are needed at the lash line. This is the only reason it didn't rate 5 star.
It works tho