Review (4/5): never did cat eyes before I bought this
My hands are occasionally shaky so I decided a stamp was the best thing to use to try cat eyes. I do have some trouble stamping the eyes evenly - not their fault! The stamp leaves crisp, clearly edged triangles. My only issue with the product is that I find it a bit hard to remove. So when I screw it up more than once my skin gets irritated by the extra rubbing and cleaning. I'm older and have a few small skin tags at the corners of my eyes and the product seems to be more difficult to remove from those.
The opposite end of the applicator is like a fine tip magic marker. I find it easy to use. It is inflexible, which some do not prefer: in the past I have found lightly flexible, paintbrush like eyeliner applicators to be annoying. They are harder to use with shaky hands and they create a small 'ticklish' or 'itchy' sensation, so I prefer this one.
In the future I may try a different company's stamp just to see if it annoys me less when I go to remove it. But hey! Maybe I'll actually get good at this and it won't be a big issue anymore!