Am in the process of finding a decent (read: lasts all day, is believable/natural-looking, has medium-to-full coverage) concealer and read several reviews below that mentioned using this foundation as a concealer with good results. So, I hied myself to the drugstore and got this in "Sand Beige"--the color looked a little too dark in the bottle, but keeping in mind the warnings about this product, I knew that it would apply lighter. Fortunately, most of the Colorstay shades appeared very neutral (not too yellow or pink or orange) and there is a good range of "beiges" (one of them is usually my Revlon color).
I have not tried to use this as a foundation since I prefer lighter, sheerer coverage for larger areas (usually a tinted moisturizer). I only need spot coverage for a few darkish acne marks/discolorations and around my eyes and nose. This stuff works great for that purpose. Much better than the Max Factor Pan-Stik I was using before. The texture is a creamy liquid, a bit thick (reminds me of Maybelline Everfresh, which I used in my teenage years to cover up zits). It does dry out rather quickly but I actually prefer that as the thicker texture makes it easier to use this as a concealer (unlike the too-slippery feeling of the Pan-Stik). I dot a tiny bit of this on and blend carefully with my fingers. I layer if I need more coverage. It looks pretty good, not cakey (though it can become so if I'm not careful about blending) and covers everything without looking obvious. I always make sure to use this on moisturized skin, though--makes it easier to blend and prevents this from emphasizing tiny flakes, etc.
The packaging is not user- or traveler-friendly as it's a heavy glass bottle. I'd definitely prefer a plastic squeeze tube with a smaller opening. As it is, I just flip the bottle over and then use what's in the cap. There's a slight "foundation" fragrance that I don't mind (I actually sorta enjoy it, oddly enough). I've been using this for the past couple of weeks as a concealer and it has not broken me out or clogged my pores yet--I do make sure to wash my face very thoroughly at night. It's a little pricey for a DG foundation (around 12 USD) but it will last forever the way I'm using it. Would repurchase.