I love MAC makeup, and their concealer covers up very well BUT (and this is a major but), MAC makeup is stage makeup, which means that it is used for performers and people who need their makeup to stay on for a long time. If you have sensitive skin, or tend to break out often like I do, then you definitely DO NOT want to use MAC face makeup (specifically any liquid makeup). I suggest using Urban Decay 24/7 concealer stick, I LOVE them. It really is the best concealer I've found. It's amazing. They're cute and compact enough that you can carry it around in your pocket for any quick touch ups. I use the UD concealer sticks along with Maybelline Pure Makeup Foundation. It's shine free it's water based, and oil free. That foundation on top of the UD concealer works AMAZINGLY!!! I usually top it off with a little bit of Too Faced Mineral Bronzer, it's lighweight and has a gorgeous but subtle glimmer to it. I absolutely LOVE it. I hope this helps you out!! Let me know if you use any of these products, and how they work out for you!!
xoxo, Ali