I love this foundation. It works great as an under eye concealer too. I apply it to my face, then add an extra swipe of it under each eye, let it sit for like 2 minutes, then rub it in and dark circles are gone. It works better then any other under eye concealer (at least for me).
However, I haven't been using it too much lately because I have been experimenting with MMU... but still, I do continue to use it under my eyes because MMU concelear is crap.