On the nail, the shimmer is less prominent. This is two coats, no topcoat. I'm thinking I should reconsider my "no topcoat for swatches" general rule, since I'm wondering if a shiny finish would have brought out the shimmer more (and I almost always wear topcoat when I do a full mani). I just wonder if I have the patience for that (and how much topcoat I'd consume).
Being me, I have about eleventy hundred deep plum shimmers, so I pulled out four of them to do comparison. Left to right below: Wet 'n' Wild Megalast Disturbia (old bottle, but I believe this made the leap to the new bottle style when they did the most recent relaunch), Sally Hansen Complete Salon Manicure Problem Child, Dior Shadow, P2 Color Victim Rich, OPI Teasy Does It.
Left to right below: Shadow, Problem Child, Shadow, Disturbia (all two coats). In indirect light like this, Problem Child makes a great substitute for Shadow. Disturbia is not as close, as its shimmer blends into the base more than the other two.
Flash brings out the differences in the base and shimmer colors. Shadow's base has a brownish dusty quality to it that sets it apart.
Here's a close up of Problem Child just because I think it's pretty, with the fine purple shimmer and copper mini flakies.
Left to right below: Shadow, Rich, Shadow, Teasey Does It (all two coats). Rich is darker than Shadow, with bright purple highlights in its shimmer. Teasy Does It is more a wine color than Shadow's plum.
Here they are in the glare of the flash:
Teasy Does It actually does look a fair bit like Shadow looks in the bottle, despite being redder in tone; it just needs more dense shimmer.
Shadow's base color makes it unique among my deep plum shimmers, but given that there are alternatives that are fairly close (and the fact that the Dior is $23) I can't say it's a must have. (Well, no nail polish is a MUST, but you all know what I mean.)