I have very hooded eyes, so I really only tightline. As a result, I need something that's very waterproof and creamy, *and* good for sensitive eyes. I've tried other liners that have just burned my eyes or smeared and/or disappeared as soon as they encountered any moisture. I bought this on a whim the other day in my ongoing quest to find a decent liner that will work for me, after having tried their gel liner and finding I just don't like it (which isn't a knock against the product; I'm terrible at applying eyeliner in general, so it's very likely user error). I tried this and was immediately hopeful because of how VERY creamy it is. I went to tightline, and bam. No problems at all. I just barely had to press, and the color glided on smoothly.
Now, I don't know how good the waterproof claims are, as I only applied it to test it and then took it off about an hour or so later. In that time, though, I can say it hadn't budged at all, so that's a positive sign.
Best of all, these things are super cheap. I think I paid about $4 for it, so I'm probably going to go back and get the sparkly version and the purple one just for fun. If you're on the hunt for a cheap, no-frills, creamy pencil liner, this one's well worth trying. If you don't like it, at least it won't break the bank.