The swatches you see above consist of one brush swipe (Shu Uemura N 10) over primed skin. It's a rather impressive pigment intensity even if the texture appears almost sheer. The navy has a significant amount of blue-silvery glitter which I could live without, but it's less pronounced on the lid, especially when packed with a stiff flat brush. The bright purple is more satiny (very fine shimmer). It's gorgeous, but I just don't have it in me to wear it on its own. I use it as an accent on top of a neutral color, from gray to taupe or for evening: over a black pencil or cream shadow. This way it adds drama and color without looking too purple.
I can't say that there's anything special about this Gucci duo. The texture is nice but I've seen nicer (the single I bought feels smoother than this particular couple); the colors are fun but not unique. The eye shadows are of decent quality and I have no complaints, but I'm not quite wowed. Perhaps it is the colors, after all.
Bottom Line: I should have chosen better.
Gucci Peacock Magnetic Color Shadow Duo ($49) is available from Saks, Neiman, and Gucci.com.