I had high hopes for this mascara, as Stila products are usually flawless. But this mascara, with its barbell-shaped brush, was just all wrong. The brush is wider at the ends than it is in the middle, so forget about getting your inner/outer edge lashes done unless you have time to clean up the skin around your eyes with makeup remover.
It is hands down the thickest, CLUMPIEST mascara I've ever used! If you comb it IMMEDIATELY after application with a flawlessly clean comb you can get a passable result. It definitely thickens - you can see the fibers as they stick between your lashes.
One coat, combed immediately and then cleaned up with some micellar water on a q-tip, definitely gave a super-dramatic lash. But it is so fibrous and clumpy and the brush is just terrible. Too bad!