I've tried Revitalash and then moved onto this at a friend's suggestion. This treatment is supposed to make the eyelashes grow thicker, longer and fuller with repeated application. Over months of usage, I've found that it does work, lashes which have been pulled out due to lash extensions still grow back, which is some feat. My lashes also grow much more quickly and so get longer quickly, don't expect miracles or new long lashes in a couple of weeks, this stuff takes months to show it's full potential with me. And my lashes do not get thicker or fuller, just longer, lanky eyelashes! If yours are full enough but too short this is for you. But if you're looking for fullness all I can say is I've fine lashes and they're no thicker or coarser now. But the quickness with which you can re-grow lashes which are even yanked out and usually wouldn't re-grow and which are harmed and thinned even by daily mascara, mean i will repurchase this unless I find something which also makes my lash diameter fuller. Worth a go if you've short lashes, really depending upon how much you care and are willing to pay.
PS. A beautician has noticed my lashes are growing almost too fast with this, am I using too much she asked, no I use it nightly as recommended by the manufacturer, I'm told my lashes are weak with this, and very fine just growing at the rate of knots.
UPDATE:
I'm trying lilash to try to improve the strength of my lashes, two weeks in and no change whereas with this Dermaquest lash stimulant my lashes seem to start lengthening within a week of using it and keep on getting long, so the choice seems with whether one wants quick results or not. You certainly get them with dermaquest.