I initially got 1, in Aqua Green because I liked the teal, mermaid type color and shine. When I put it on my eyes, I immediately thought this was buttery, creamy, and so so easy to put on and smudge a bit. I wore it all day for work one day and got so many compliments. I just had that and mascara on! I had absolutely no smudging either, which is pretty impressive for my oily eyelids and watery eyes. Granted, I did not wear this on my waterline.
The next day Ulta came out with a sale for 40% off and I grabbed 2 more. Deep Blue and Gypsy Blue. Both just as creamy and smooth as the first. I'm so impressed with these eyeliners. The price is cheap, and if you catch them on sale for buy one get one 50% off, or 40% off, with the typical Ulta coupon of $3.50 off when you buy more than $10, it's such a great great deal.
Something that I found on Pinterest: For blue eyes, grab the deep blue and a silver eyeliner (I got the ScandalEyes from Rimmel) and place the deep blue as close to the lash line as possible, making a semi-thick line. Then, layer the silver right above the blue. The way these two eyeliners blended was pretty darn awesome, making almost a gradient type of effect upwards. This creates such a pretty look that makes blue eyes pop a bit. It's one of my go to looks for the summer now.
For a more bold look, grab the Aqua Green and place that down pretty thick on your lash line, then take a black liquid eyeliner and create a line as close to the lash line as possible right on top of the Aqua Green color. This creates such a statement that I also found on Pinterest that just works so great with this NYX eyeliner.
TL;DR: Great eyeliners, no smudging on my oily eyelids, smooth, buttery, only positives coming from me. Love them.