Maybe mine is just a faulty one, I don't know, but it didn't preform nearly as well as it did in the shop. As you can see the nib is incredibly fine. The point of the nib doesn't seem to really disperse much product. This means you have to press harder to use more of the nib, which then results in a thicker line. All this makes the liner quite hard to work with. It almost drags along the eye.
The wear time also isn't great with my oily lids. I found at the end of the day it had smudged everywhere - not good! If you have drier skin it may last longer.
I do like the matte finish, I much prefer it to Carbon Gloss. The thin pen shape is easy to hold, and to store and the textured part gives a good grip. The black and gold theme does make visually pleasing packaging!
Have any of you tried the Perfect Slim liner?