I bought this to replace my Kat Von D Tattoo liner, which has been my ride or die for a couple of years now, and I have to say that I was not disappointed. The length and thickness of the felt tip applicator makes it very easy to create both thin and thicker lines, and creating the perfect wing is a dream. The weight and length of the pen make it easy to hold, and the fact that the lid attaches to the other end when it's open is really handy. For ease of application and ergonomics, I would say that this just beats the Kat Von D. The best thing about the Kat Von D is the staying power, and here Fenty matches up very well too. The liner stays put all day, all night, at the gym, wherever.
One thing I will say is that the formula is very wet and takes a little while to dry down - this is not necessarily a bad thing as it makes it super easy to clean up mistakes, however those with hooded eyes should be cautious as it will transfer onto your upper lid if you don't set it or leave it a while to dry off completely. For me this might be a good thing as I find my Kat Von D dries out within a couple of months, so the Fenty may last longer, but time will tell.
Overall, this is exactly what I expect from a high end longwear liner and I will definitely be repurchasing. Bravo Fenty!