I have two of these - 'Invincible red', which is a medium red shade and 'Golden Plum' which is a shimmery peachy nude shade.
Both of these liners boast an incredibly creamy consistency that doesn't drag or skip on your lips whatsoever. They are highly pigmented and need only one pass to fully line your lips. Despite being so creamy they don't slide around your lips or travel during the day.
These are twist up pencils, which are my favourite. The nib of the pencil is the perfect size to be able to create an accurate outline of your lips.
Once applied, these tend to last all day on me and I don't feel the need to take them with me for touch ups. Granted the pigment wears out as time goes on, but I expect that with a lipstick and a lip liner is no different.
I have had these for a few months now and I use the red one every time I wear a red lipstick. Even though the red shade has seen a lot of love, there is still about 1/4 of the pencil left. Because you don't need much these last a long time, and for the price you honestly can't go wrong.
Pick up the shade 'Nude' or if you can find it 'Always toasted'. Both of these are great pinky/mauvey nudes with just enough peach, mauve and brown to look natural yet defined. The lasting power of these is reasonable too and they are decently priced for such good shades. They are smooth and easy to apply with no-dragging. I am always on the hunt for the perfect nude pink liner and these are right up there with some of my high-end pencils!
Tips: These are prone to drying out so make sure you keep the cap on nice and tightly!