Although this isn't a review for Dior's "Extase" mascara (my previous, almost-there-but-not-quite-right choice), I could have titled this "Extase"---because I am in ecstasy. This is (for me) THE Perfect Mascara.
With one coat, it gives me thicker, fuller, completely natural-looking-but-spectacular, fetchingly curved and curled lashes that are black but not BLACK---and that don't look as if spiders have decided to live above my eyes.
And with two coats, I get thicker, more dramatic lashes than I've ever had before that look just like I'm wearing the best false-lashes...but don't make me look like a drag-queen (a perfectly valid look, but not the one I'm trying to achieve).
The formula is phenomenally long-wearing (and I'm VERY tough on mascara, inevitably ending up with raccoon smudges after a few hours) but not harsh: I don't ever have that awful feeling that there's a sliver of...something in my eyes that wants OUT that I forcibly endure with other long-wearing mascaras for vanity's sake.
Application does take a little initial fiddling: I've found that if you place the curve of the brush against the base of the lashes and then do that wee "wiggle-up" motion a couple of times (the same motion that those battery-powered mascaras produce that one can easily replicate oneself), all the lashes get coated, separated, and curled perfectly.
By adjusting the placement of the brush, you can also mimic the addition of false lashes to, say, only the outer corners of the eye (which opens up the eye and gives that "Come Hither"/kitty-cat look).
Yeah: it's pricey, but I think that it's worth every penny---and, if you compare it to the cost of, say, lash-extensions (which more than one person has asked me if I'd gotten) or even a good pair of falsies? Whatta deal!!!
So, IMHO, this is one of those rare products that is quietly revolutionary, unparalleled, spectacular, and, well, non-pareil!