I actually found this highlighter when I was in Sephora returning one of the Hourglass Ambient Lighting Powders which didn't work out for me. One of the MUAs at the store directed me to this and I fell in love and I wasn't even looking for a highlighter at the time.
The compact has an interesting spaceship look to me. The brown outer rim and underside have the same soft rubbery feel as Nars products.
I'm not sure about the other shades but the shade that I have, Opal is NOT an allover powder, it is far too shimmery. It's an absolutely stunning highlight for your cheekbones and brow bones, though I mainly use it on my cheekbones.
Have you tried this highlighter? What do you think?