Sometimes it takes going without a product to realize how well it works... I have hooded and oily eyelids. I use this every day, no matter what type of shadow I'm using (cream, pressed or loose powder). One day I decided to skip UDPP because I didn't think I would be out that long. I changed my plans and did end up staying out a lot longer than I orginally planned on. To make a long story short, I was so surprised at how much my shadow had creased after about 4 hours (I had on UD Mushroom btw). When I use this, I will sometimes have extremely minor creasing after about 10 hours, but usually nothing very noticeable. So, for me primer is a must have. I've had the same tube for about a year and a half. So it lasts a long time.
Now for the cons. Sometimes I feel as if this doesn't always dry completely transparent. I have medium/dark olive skin. Sometimes this will make my eyelids a little ashy looking, and I don't like the effect. I would think that this might be difficult for those with darker skin to use.