I have used Rimmel liquid eye-liner for years! I have tried other brands but nothing compares!
I am going to explain why i think this eyeliner is so great.

It comes in a matt black which is to my preference as im not into shiney eyeliners. The bottles in small long and discreet making it easy to fit into your purse. The nip is slender making the product relativity easy to apply, even for beginners. The line isn't really think so people of all taste can use it making the lines wider if needed. The product isn't gloopy, again making it easy to apply. I have sensitive skin and only on rare occasions has it stung me.

The product is long lasting and doesn't smudge or crack throughout the day like other cheaper brands. It is also quite easily to re-apply if you want to patch up the eyeliner in the day if it has slightly worn off.

I have found the product is easy to remove so that don't have to rub for ages causing stingey eyes. I use a boots sensitive make-up remover which seems to remove really easily. On the odd occasions that i have been out an havnt had my remover with me water seems to do the trick!