This is one of the things I brought where I thought I could grab a bargain but for the price it delivered the same amount of quality for me. I brought one of these in pink fleur from warehouse last year some time.
The first time using it, it glided on easy over the lips, every other time after that it hardened and became very difficult to draw over my lips without applying a lot of pressure. Because of this issue I don't use it anymore.
It is pigmented and overall colour is great, it lasts hours and prevents your lipstick from moving, the only trouble is the hardness of the pencil.
I haven't brought any others after buying Pink fleur because how hard the formula became, but I think I got that for paying such a cheap price.
I have a lip liner in the shade Sienna P504. I picked it up for $1 at one of those makeup clearances and it works amazingly! It's super moisturising, highly pigmented and does as it says! I love the smooth formula, and it doesn't cling to any dry patches which is great. The staying power is great too! Lasts even when your lipstick comes off. I would definitely purchase more shades, they are super affordable and work like a dream. Must have product!
Tips: I like to use a slightly darker lip liner, and overdraw my lip line just a little, so that I get the illusion of big, pouty lips! Works well, as most of my lipsticks are nudes, and this shade is a darker nude colour. Also, use it under lipstick - makes the lipstick last longer!