Wow, I can't believe I'm just now discovering this foundation. It's perfect for my oil-slick skin and has yet to cause a breakout for me and I'm very acne-prone. The 24 claim of long-wear is totally bogus, but it does last through my 8 hours shift no problem! The formula doesn't oxidize or get shiny like the majority of DS foundations do on my skin so basically, I'm in love! It provides medium coverage (I like full coverage most days so I add concealer after applying it with a beauty blender). Some people claim it's cakey or has a mask-like effect which I haven't noticed, although it dries fast so you must work quickly before it sets. My only beef with colorstay is the horrible shade selection, mind you I have yellow-toned NC 20-25 skin but my closest loreal color match, sand beige, is too yellow bordering on having an olive undertone. I've noticed the color range is either too yellow or pink, there aren't any neutral tones which is a bummer. This would be a 5 lippy HG if only I could find my perfect shade, but if you have oily skin that resists foundation, you've gotta try it & you'll be amazed that skin can look this flawless:)
****EDIT 4/25/13: my skin has been breaking out in tiny bumps all over and I'm sad to say this foundation is the culprit...if you read the ingredients, salacylic acid is mentioned and I had no idea this contained SA, if I knew I wouldn't have bought it. My skin hates salacylic acid, but it may work for others who aren't sensitive to its ingredients. This is going right back to where I bought it for a refund!