I first spotted this liner on Lotus Palace, and it caught my attention because I like the effect tightlining gives, but always skip it since I find it time consuming.
The liner has 3 felt tip 'prongs' which makes it easy to wiggle between your lashes to deposit colour. And in case you're worried, the tips are not harsh at all - they are basically similar to the usual felt tip liners you get from Revlon, L'oreal, etc.
The liner makes it easier in my opinion to tightline than a regular liquid or pencil liner. Compared with using a brush and gel liner, they are about the same level of difficulty. However using this liner cuts out the step of having to clean your brush afterwards, meaning its travel friendly as well!
(no mascara, just curled lashes)
The Kate liner isn't waterproof, but is sweat and smudgeproof once dry - no raccoon eyes! I find that the effect is subtle, but great for natural, no makeup look. My lashes are also not that thick so it helps give the illusion of thicker lashes even if my mascara isn't cutting it.
Do you tightline at all? What's your preferred method of doing it?