How do I love thee, let me count the ways:
- The best thing I find about Luminous Silk is the silky (duh), slippery texture that glides over the skin effortlessly. I have to blend most other foundations very carefully over small areas of my face to avoid cakey spots. With this one, I got completely lazy - I can slap a pump's worth into the middle of my face, slather it around, and it gives me a completely even, perfectly blended coverage without drying up and setting too fast and clinging to skin patches. For a light all-over application, I get the best results when I use my fingers and simply spread it around just like a moisturizer. (Some reviews mentioned that they hated LS when using it with the Beauty Blender, and I hated the BB when using it with this foundation, so it looks like they're not compatible, if that's your preferred application method. Not a problem for me, but LS is rather light and thin, so sponges and brushes soak it up quite easily.)
- It can be built up from about medium-light to medium-heavy coverage without looking heavy. On the days when the above is not enough, I like to take a bit more and apply it with a tapping motion wherever I need it, either with my fingers or a brush. This covers any redness, capillaries, faded scars and light spots. It won't cover anything too dark/red, but I'd rather use a concealer than a heavy foundation for that.
- The finish, despite the name, is rather natural with slight dewiness. For me (normal skin that's sometimes prone to dryness and can get oily towards the end of the day), it's perfect - anything more matte looks dry and patchy on me, and anything richer sits on top of the skin, and I just end up using too much powder to get rid of the tacky feel. This may not be the best foundation for those who have very dry skin, though - I tried using it after a (bad) experiment with a salicylic acid toner, and it did emphasize the skin flakes.
- It stays on quite well for 8-12 hours. It does get shiny in the middle of the day and fade a bit towards the evening, of course, but it never breaks down in patches (Chanel's Vitalumiere Aqua!) or otherwise looks offensive.
All in all, like any foundation, it won't suit every single skin type, but it's a fantastic in-between option - not too heavy, not too light, not too matte and not too dewy. I've been using this for about 10 years now, and every time I "cheated" on it with a different foundation, I regretted it.