I love eyeliner, and thanks to my sister I find it easy to do.
The first thing that struck me about this product was the smell - its quite clinical and a little odd for an eye product. But you don't smell it when it's on your eyes so I guess that's a minor grumble.
The long handle of the brush makes it easy to hold and use, there's room for different positions, depending on which hand/eye you're doing.
It's not too runny, not too thick. It dries quite quickly, so there's not much time to correct a boo-boo. It's longwear, up to 36 hours. I've not stayed awake for 36 hours in the last decade, but I'm happy to report it lasts the working day.
The black is a deep dark black, and the line drawn isn't patchy at all.