I bought this eye liner to try on because it was on sale for around $6. The application was easy, it glided on fairly decent. After around 5-6 hours of wear, the outer corners or my lid started to smudge, even though the package says "waterproof", if it can't withstand a little bit of sun, I definitely can't wear it confidently everyday. The only good side to buying this gel liner is that it is very affordable and also comes with a eye liner brush for application.

Great product.

Rimmel London scandal eyes waterproof gel eyeliner
I wear blackest black and find that this product is great to pop in my mini make up bag for the day, it comes in a small pot with a brush applicator in a tube on top. This product is rather easy to use whether you want a thick line or thin line of eyeliner, I find it last the day sometimes I may have to touch up towards the inner area of my eye.The gel colour is perfect and isn't to thick or watery like some can be, and I love the applicator for doing flicks with as it apples ever so easily and you can get a perfect flick every time.
However for those who aren't used to the product it's self may find it slightly more difficult to use at first to get the right amount and how it is comfortable for them to hold it but apart from that I find a very good product.