Cons: sadly, this product smudges in a very significant way. In fact, it smudges more than a simple kohl eye pencil, and has even less staying power. After an hour of wearing, I noticed that the stamped dots simply wore right off in the inner corner of my eyes, and smudging below my lower lashline. In my mind, this undermines the purpose of the product. What a bummer! Also, if you have a steady hand with liquid eye liner, you'll find that this type of product actually takes longer to apply on the upper lash line than a regular liquid liner.
Bottom line: I'd avoid this one and try one of the others in the hope that somebody has come up with a smudge-resistant formulation.