This brush from Guerlain by Emilio Pucci may be considered old news, but since it's still available for purchase I thought I'd go ahead and share what I think about it. If you own any of the Guerlain Meteorites, I think this brush comes in handy. I own a lot of face powder brushes and none of them pick up powder off the little pearls like this one does. It's not a super soft brush and feels a little prickly when putting it on your face. It does an excellent job for what it's meant to do but I probably wouldn't use it with any other product.
Here is what Sephora's website say's about the product:
What it is:
An elegant Kabuki-style powder brush.
What it does:
This brush is designed to work perfectly with the Météorites Perles d’Azur pigments and to pick up just the right amount of Terra Azzurra Powder. The brush, decked out in chic midnight blue, is stored in a stylish Pucci print pouch.