I was a bit confused by this product at first. It seemed weird that it was encased in plastic that you have to sharpen. It's really hard on the sharpener and on the plastic, which doesn't sharpen evenly. This is my major grievance with the product, which would all be fixed if they made it in a twist up/no sharpen format.
I'm really impressed with it as a primer though. For me it's quite long lasting. It gets me through the workday without any smudging, and a few hours after that too. It ends up being my eyeliner that smudges in the end! It works especially well with some creme eyeshadows that I have by CoverGirl- it somehow extends it's staying power.
One thing to watch out for is how fast it dries. It's rather thick to put on (so I wouldn't recommend it for super sensitive eyelids since it pulls a bit) and if I don't blend it immediately it becomes fixed where it is.
Because it's pigmented for colour correction, I don't really understand why there's only one colour option. I might actually go a shade darker if they had it as it seems to lighten up my skin a lot. It does a good job with coverage and evening skin tone though.