Blimey it's revolutionised my eyes and technique!
I have teeny piggy eyes (hooded now, saving for surgery!) and some nerve issue making it harder to have a steady hand.
I originally wanted to know about tight lining but my eyes are tiny.
Used it to line my eyes and it's fabulous. Much better than my usual pen or brush.
Expensive (£21) so will see how long it lasts with almost daily use.