As it's heavy on the silicone, it's not one for acne sufferers, and the lack of moisturising properties means that dry skin prone people should give it a miss too. Personally, I'd never use it in the winter when I battle with my skin daily to keep hydrated (La Prarie, you are my best friend) as it can cling to dry patches.
However, in hotter weather when your foundation has a tendency to slip and slide, this one's a miracle for 'gripping' your makeup and extending its wear. It's in a lovely glass bottle which looks good on the dresser, but not ideal for on the move. It's also got a rather off-putting paint-like pong, a perennial problem with Revlon's products (ugh Colorstay ugh) but it soon disappears. In my opinion, it's worth putting up with for the baby-soft skin it creates. It's not a one-primer-fits-all solution, but if it works for you, the results are flawless.
