I've tried a few gel liners but MAC's Fluidline Eye Liner seems to work the best for me. The consistency is great and it doesn't get dried out as fast as some of the other gel liners I've tried. A lot goes a long ways and it's so much smoother to apply than other gel liners. Blacktrack is truly a matte black and I love it. I do have to remove one lippie because 3 hours after I applied it, it sort of smudged at the outter corners of my eyes. But most eyeliners do (i.e. liquids and pencils) smudge on me even with a primer, which is a bummer. I have really oily eye lids. It's about $15 a pot, but this stuff lasts a long time. Just make sure you close the pot even when lining your eyes just to give it a longer shelf life because if you leave it open too long, it tends to dry out faster and that rule should be applied to any gel liners you use. I will definitely repurchase whenever it runs out.

I bought this as a replacement for my Bobbi Brown gel liner which dried up too quickly. I think MAC's has a nicer consistency - it seems much smoother going on - and although it smudges a little, the damage is less than with BB's gel liners. I also like that the black is a very dark matte black.

This stuff is expensive, especially with the brush, but it works SO well and it definitely worth it. I can't even remember when I bought it I have had it for so long, lasts forever! I don't use this on my waterline but some of my friends do and it stays on forever! It also comes off easy with face wash, I don't even use makeup remover. I would recommend buying the MAC angle brush that goes with this to get the best application. Best eyeliner I have tried!

This is the first MAC product I've tried and so far I'm sold. I love the look I can achieve with this! I had previously been using the Revlon Colorstay pencil (my former HG), but it smudged like crazy on my waterline. I needed something to hold up and found this gem. The finish looks similar to what I got from Colorstay, but there is ABSOLUTELY NO SMUDGING. I was sooo suprised when I came home and saw that my eye makeup stayed in place! The jar is great except for it being made of glass, so I only gave a 4 for packaging. I use theBalm eyeliner brush from Sephora (it was only 5 bucks!) and it is so easy to use. However, the only thing I have against this is that it doesn't apply well over damp skin. It leaves a grayish color, so make sure your eyes are completely dry. Other than that, this is great.

The first eye liner that I have owned that stays on the water line until you remove it. I know that you're not supposed to use it on the water line, but I have done so for almost a year with no problems.

Also the first eyeliner that I have owned that does not smudge. I previously used MAC powerpoint eye pencil; and while I prefer applying eye liner with a pencil, I have noticed that it smudged every day. Fluidline stays put and does not smudge at all. I also noticed that by applying fluidline to my waterline, I'm also able to 'blacken' the inner parts of my lashes that are hard to apply mascara to.

I use this product everyday and have never thought about looking for a different eyeliner to try.

Product packaging is great, especially for MAC as I find their packaging on some products is a bit cheap. Fluidline comes in a nice heavy jar. Just be sure to close the screw cap as soon as possible after use or the product will start to dry out.

Product lasts a very long time, as only a little bit is needed to line the eye.

Is much easier to apply than a liquid eye line, and has more staying power than a pencil.

Yesterday I tried the mac fluid line for my waterline area and went to college afterward. After I arrived at home it kind of smudged on the corner of my eyes so I am not sure about the no smudging part with this product.

Master of all eye liners!
I am in LOVE with this product, not only is it so easy to apply [with a 209 brush or anything similar] but it stays on FOREVER - no smudge no budge! I never have to retouch it even if I've had it on alllllll day! - Now I don't like putting it on my waterline but that is where the mac waterproof eyeliner pencil [or retractable whatever fits your preference]
and i love this product cause they have so many colors! [which you can also use as a base as well] looove it <3

I have been searching for the perfect black eyeliner that doesn't smudge and i found it. This eyeliner works better than any eyeliner i have ever tried and i have tried a bunch. The color does come off a little, but it is very little compared to the other eyeliners i have had. Excellent product and i will definitely be repurchasing.

It is amazing. I need so little and it works like a dream. It is really pigmented and glides on smoothly. It even stays on the waterline. The hype is for real guys.
FYI, i used L'Oreal HIP's black gel liner, and I heard that it was identical. It is not. It's close, but I like Fluidline better. Fluidline's consistency makes it easier to work with.

This is an awesome gel liner. It really is a nice true black and wears very well. All I can say though is Coastal Scents has the same thing for $7 and it works just as well so that is why it doesn't get a 5 from me. Really last forever,too. If you were it every other day it will take you 3 years to get through the whole thing! Goes on nicely without any skips. My fav Fluidline is Waveline. It is a pretty purple blue. If you like liners with color to them check out Waveline.