Firstly let me thank Alice (lissa_g) for recommending this primer...thank you, thank you, thank you!! ; )
This stuff is amazing. My e/s usually creases towards the end of the afternoon, esp if it has been a warm day. Cream shadows don't even last that long on me. I put this on in a thin layer, it disappears immediately and feels very slight tacky but not at all uncomfortable. I put my shadow on at 6.15 am and when I went to remove it at 12.30am the following morning it was absolutely PERFECT! Not a budge! It doesn't interfere with the e/s so it's still easy to apply, blend, smudge etc and it also held my eye liner in place perfectly. It costs £9.50 in the UK which is reasonable as I imagine the tube will last for some time.
One of the best products EVER!!