Wow, this is a really wonderful product! I was in the duty free store at the Milan airport a week ago and browsing, not really intending to get anything, when I came upon the La Prairie display. I remembered people raving about the liquid foundations, but didn't remember any reviews on the powder. Since they had testers, I took a swipe of the powder and was instantly in love with the texture.
it is very silky and glides onto the skin. I would imagine it would work well for most skintypes -- for drier types, I think this powder would help keep the moisture in, and for oilier types, this definitely keeps the oiliness at bay. I have a very oily t-zone, and only had to blot once in the afternoon, which is very impressive. It does not settle into the pores or emphasize dry patches. Rather, it creates a very smooth surface.
The coverage is quite full when used dry (this can also be used wet, though I have never tried), and I only need a touch of concealer beforehand to make my skin look flawless. The finish is matte without looking flat or dull. This blows MAC Studio Fix, Bobbi Brown powder foundation, and Stila Illuminating powder foundation out of the water. It's better than Chanel (controls oil better), and is less heavy looking than Dior (which was my previous HG powder foundation.) Compared to La Mer's powder foundation, LP gives more coverage and controls oil better. (La Mer is a mineral powder and thus has a more shimmery finish.)
Quite a pricey foundation (I purchased this for 55 Euros, or about $80USD at current exchange), but worth every penny. Plus, the silver rectangular compact is quite elegant and pretty. For reference, I purchased the Ivory shade, and I am about NC20 in MAC, or a light golden beige complexion. I think they have 6 or so colors total.
Overall, a must-have in my makeup bag, and a purchase I would recommend to others.