As others have observed, this is a heavy-coverage foundation that can dry the skin. However, I have oily skin with occasional breakouts, so these qualities aren't bad ones in my opinion.
Pros: Very long-lasting. Good coverage of flaws. Matte appearance. The lightest colour in the line (Ivory) looks good on my PPP complexion. Packaging is recyclable (glass), which for me counts for a lot... I don't want my "beauty" to translate into a mound of landfill someday.
Cons: Can look pasty or masklike if overapplied. Dries almost instantly upon application, and is not easy to remove. Doesn't include SPF - which all foundations should, in my opinion. (How come Colorstay Lite Makeup has SPF 15, while Colorstay Makeup has none? Does Revlon imagine that Colorstay Makeup customers are immune to skin cancer?)
Solutions to "cons": I begin by putting on my preferred light moisturizer-with-sunscreen (Lubriderm UV 15), then applying Colorstay very sparingly. The remaining traces of moisturizer give the extra "glide" I need to smooth and blend the foundation.
Extras: When I want lighter foundation, which is most of the time, I use Colorstay Lite (Ivory). However, if I have a blemish or reddened skin, I use a dab or two of the heavier Colorstay foundation as spot coverage to hide the problem. Colorstay Ivory and Colorstay Lite Ivory blend very nicely!