I've been buying Guerlain products lately & started collecting their famous products, that being said, i didn't miss to get this beautiful looking primer. The packaging stands out among other primers in the market today. As with Guerlain packaging in general, they're classy & some are quite heavy in material. The primer is runny like normal face serums & it has shimmers which came from the pearls. I don't think that this is an outstanding primer but it works great in conjunction with Guerlain foundations. I wore this under Parure Extreme foundation (I have separate review on that) which doesn't have full coverage & the shimmery glow from the primer still stood out. A heavier foundation will make this primer lose it's glory (useless in short) & basically do nothing to change your complexion. It's better to purchase Guerlain Meteorites balls if you're after the glow effect. Given that, this primer can become weak in light-diffusing purposes depending on the foundation used. Another set back is I don't think it's even good for adhering your makeup longer. It smooths the skin coz of its serum-like texture, adds glow & will work better under powder foundation. It's an OK product but not a must-have.