I've used primers by Nars and Laura Mercier in the past, and was pretty happy. They definitely helped my concealer stay put, and Laura Mercier gave me a little glow. But I kept hearing about Smashbox's primer, and as I've been trying to move more toward cruelty-free products (Smashbox/Estee Lauder is cruelty free as of 2017), decided to give it a try. OMG, I HAD NO IDEA BEFORE WHAT A PRIMER COULD DO. See, in the past, if I happened to forget my primer step, I wouldn't really notice a difference in application/texture, just longevity. Now, if I inadvertently skip my Photo Finish primer, I see IMMEDIATELY that my concealer is wearing differently (I use Tarte Shape Tape applied with a damp beauty blender). It will look dryer, more settled into my fine lines, and overall just more makeup-y. I'll actually clean it off and reapply with my primer! Smashbox's Photo Finish primer makes my skin smooth and baby soft to the touch, and makes my concealer look like my natural skin, just with better complexion.