Great Gel liner ! I naturally have very oily lids &all gel eyeliners I've tried (Maybelline gel liner, HIP creme liner) seem to smudge onto my lids bc I have pretty small lid space. But this is probably the only gel liner that doesn't do it. Sometimes, if you aren't careful &you don't wait for it to dry, it can start to smudge a little, but once it's dry, it stays put. I mainly only use it to tightline, bc I like the effect it gives my lashes &it doesn't transfer to my waterline. It's hard to believe it works so well bc of how inexpensive it is. I don't use the brush though, I use a different angled brush bc the one that it comes w/ is rough. I've never tried MAC fluidline, but I feel that I don't need to. Only thing I don't like is that it doesn't completely stay on the tightline &it starts to fade close to the edges, but it's not too bad.