I thought this would make doing wings, cat eyes, whatever, much easier, but no, it's still hard for me. This is probably more my fault as I'm still trying to master this look, but this eyeliner is not the magic bullet either. A few things that bug me: It's not dark enough - goes on with transparency almost like a wash instead of an opaque ink. The edges bled/feathered on my skin, maybe my skin was too moist tho??? Will apply primer on next attempt. And it didn't dry fast enough - I blinked after applying and it smudged in the corner. I will say that once it dries it does stay put ALL day which is amazing. As for the lash boosting serum, it's probably just marketing hype. I seriously doubt that I will see any improvement there, but it's too soon to report.
Update: tried it with eyelid primer and it stayed put much better while inside, but then I was outside in the heat for a happy hour, got a bit sweaty and it started to smudge and transfer to my upper lid & crease. Ugh.