Why I didn't get this sooner - I tested out a few shimmerbricks (beige and bronze, I think) when they first arrived at my nearest CCO. They were too sparkly, with chunky glitter, and looked awful in the store lighting and worse outdoors. My curiosity got the better of me, and I ended up getting this Shimmer Brick from a lovely swapper - and was pleasantly surprised that this was not the glittery mess the others were.
Product - Lovely. There are five shimmering stripes of color: one white, two rosy brown shades, and two rosy pink shades. With my AAB/NC25 skin, this can be used as a light blush - apply just enough to get a sheer wash of pigment but not too much of the sheen; also can be applied lightly as a highlighter. I can see how the sheen might accentuate flawed skin, so Buyer Beware, YMMV. The individual stripes of color can be used as e/s too.
Comparisons - As a highlighter, it is similar to LM Star Dust, where the finish is more of a satiny sheen than a shimmer. As a blush, the color is reminiscent of my TBS Brush On Beads in Rose - similar light dash of color but the TBS is more of a blush than a highlighter.
Packaging - The packaging is the usual sturdy, chunky BB palette/compact style, square and black and shiny smooth with a full size mirror. There is an oddly large amount of space between the surface of the product and the mirrored lid - perhaps this is why the Shimmer Bricks are notorious for cracking and crumbling during travel and/or shipment? - so my packaging rating is not high. Also, the lid only opens up to 90 degrees, which can make it awkward to use the mirror.
Rating - Overall, a pleasant surprise. Five lippies for the product, minus one for it being something I don't reach for daily. Not sure I would purchase this at full retail due to its high price tag ($38), though I'm quite happy to have swapped for it.
UPDATE - Overall rating bumped up to 5 lippies. I love it. It is unique among my collection of blushes. I use this by itself as blush on "light" makeup days and sometimes as a highlighter over other blushes.