Urban Decay Naked Skin contains 30ml of product (the norm for foundation) and comes in a sleek, attractive bottle with a pump (hallelujah). The formula is quite thin and liquidy which I'm personally not used to, but it's really easy to apply and blend out. It's definitely a more sheer foundation but can be built up to at least medium coverage. You would still need to use a concealer if you have really stubborn dark circles or a blemish, though. Overall, it helps to even out the tone of my skin and seems to lift and brighten my face as well. It's lightweight with a natural finish (UD says it's a demi-matte finish) and looks and feels as if I'm not even wearing foundation. I love it! As for lasting power, this wears well on me throughout the whole day (I have drier skin going into this time of year).
So, if you're looking for something that will give your complexion that little boost without being heavy or too much coverage then I would recommend Naked Skin, whereas if you need a foundation with some mean coverage you'll most likely be disappointed with it. Have you tried it?