Per the brand, it's supposed to be a "magically-transformative liquid eyeshadow" that has "color-flip pigments" that give it a "unique, color-changing, megawatt finish." It is supposed to be "long-wearing" with "minimal fallout." There's no specific callout about coverage level, but the brand's swatches shown fairly pigmented skin swatches and then opaque coverage on their model eye swatches.
A lot of the shades had a translucent, almost sooty black base, which resulted in them not working well to brighten, which often glittery products like these would be used for--and the sheerness of them made them even more likely to be used to pop on top of other shades or used in the inner tearduct to add extra oomph. They were very watery, and some shades require more "mixing" prior to application (which was hard to do on the applicator, so a separate brush would be best) or else they go on unevenly. I did not detect "color-flip" or shift with the majority of shades; they were sparkly, glittery, and/or metallic, so they had some shine and twinkle, but shift? Not so much.
They were very sheer, and they did not build up well, regardless of whether I used the included applicator, separate brush, or fingertips, and I always made to sure to let it dry down fully prior to doing so. The product was wet enough for long enough that it had a tendency to get into creases and fine lines, which yielded a patchier, more uneven application than intended. I don't know what purpose these are serving in Stila's line except to make me question future quality of these types of products, as their Glitter & Glows are very, very similar but tend to be much better performing.
The average rating based on all reviewed shade(s) in this formula is shown below.