Not bad.
It's kind of annoying since I don't have stellar perfect eyesight - you can't see where the opening is, plus it's usually like 6 am when I'm applying it.  Had to take a silver permanent marker to indicate where the opening is.  Other than that, can't say I've noticed a huge difference in keeping makeup on, but perhaps it's not the primer, perhaps its how I'm applying it.  Don't know for sure.
Rating: 3 stars