Just to get this out of the way: If you have oily skin, don't bother with this. It won't work for you. I also don't recommend it if you have bad skin with lots of blemishes or blotches you want to cover.
Now, for those of you with fairly even skin that is normal to dry, and ESPECIALLY those of you who are over 50 with very dry skin, this is definitely worth getting. It's really important as we age to not wear really heavy foundations as they are quite aging, and so this foundation really hits all the right marks in that regard.
The coverage is sheer but buildable up to a sheer/medium. Because of the sheerness, the colors are very forgiving and you don't have to worry about getting an exact color match. I got shade 4, which doesn't quite match my undertone but will be my perfect summer color, and in the fall I plan to get shade 3. The finish is fairly dewy. Even though my skin is dry, I set it with a VERY faint dusting of Laura Mercier loose powder. I'm afraid it would melt off my skin if I didn't set it.
It does not settle into fine lines, and it leaves my skin feeling super hydrated and comfortable. In fact, it is so hydrating that I've been able to go back to using Nars creamy concealer with it. I had stopped using that Nars concealer because I found it really dried out my under-eye area and accentuated under-eye lines when used with my other foundations, but this Charlotte Tilbury foundation is so emollient that the Nars concealer suddenly works well and just glides on.
If you are looking for a heavy foundation that gives you a really polished look, then this is not for you, but if you have pretty good skin and want something light that will give you a healthy glow, check this stuff out!