Has anyone used the new Estee Lauder Little black primer? I'm considering getting it but not sure. I love the mascaras and I don't usually wear primers under mascara but I'm interested in trying this because the color is black. The white mascara primers don't seem to work for me. I find it hard to cover the white primer so it doesn't show through. Seems like to much work for me. I figured black primer would be easier to use. Just wondering if mascara primers really are necessary and make a difference enough worth the extra step?