I love this product, I don't know what I did before having it. I got a small sample as a birthday present and I'm desperate to get my hands on some more (which is a bit difficult in NZ but I'll get there).
You only need to apply a tiny amount, and it spreads really easily over the eyelid. It lets any eyeshadw you apply afterwards have a much longer lasting time, and it also gives a greater colour pay-off.
The only slight issue is that there is a clear liquid that separates from the rest of the product so use the tip in another review below and squeeze the tube a few times before opening to mix the product together.
Love love love this stuff, makes eyeshadow stay and looks more intense. Wish it was easier to get though.
Tips: Lightly squeeze with lid on to mix so you don't just get the oil. Give it a minute before applying eyeshadow. You don't need too much.