Not very similar to the name brand.
*According to Cruelty-Free Kitty, NYX is cruelty-free, but MAC is NOT. Makeup Maven, Kimberly, says: MAC's Pro Longwear Paint Pot and NYX's Eyeshadow Base are completely different products. MAC offers this primer in 6 shades and NYX offers it in 3. NYX has a thin, greasy consistency while MAC was thick and almost felt like a potted concealer. A lot of beauty gurus state they enjoy this NYX primer because one of their shades is white, but if you are already fair-skinned you won't see this color-payoff. Only a few hours after application with NYX, my eyeshadow creased! It was extremely disappointing to see my eyeshadow moving around my eyelid throughout the day. MAC, on the other hand, didn't budge. Though they don't offer the primer in white, their product has a very slight tint to it, and it is beautiful with eyeshadow, or worn completely alone! Definitely worth the splurge!
I actually love the NYX eyeshadow primer. I use it every day but there is a trick to using it. I find the setting it with a fleshy shade or whatever base shade I’m using that day makes all the difference in how it lasts. Also a small amount goes a long way! I put a thin layer on my lid and then blend it out with my finger. This line also has a black base that for some reason isn’t ever listed with the other three colors. I’ve yet to replace this in my kit.
I have used the Mac paint pots and I really do love them, they keep my eyeshadow in place with no problems. I also have tried the Nyx and enjoyed it as well, you can’t beat the price difference. My skin is dry so I had no problems with either product creasing.