I like some of their products. The All Over Color Sticks work AMAZINGLY as eyeshadow bases, and the skin toned All Over Color Sticks are really good as bases too and are actually pretty good spot concealers in their own right. That's great, because they're only a buck.
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I really like their Super Gloss SPF 15 glosses, they're not SUPER glossy, but it works. The texture is really creamy and I adore the smell and look on my lips. The lasting power is pretty great too, especially for a gloss.
I also adore their foundation brush, eyeshadow brush, and eyeliner brush. The other brush I have (bronzing/blush brush) is okay for the price, but it's not very good. It gets scratchy and doesn't pick up enough color. I've heard good things about their Studio Brushes (which are only 3 bucks a pop!), they're really soft but have this bad smell that a few washes will take care of, they have synthetic hair. I like their eyelash curler also, it REALLY holds a curl, but you have to be sturdy with it because if your hand slips, say bye bye to 12 of your eyelashes!
(Personal experience, bleh. Couldn't curl my lashes for months.)
I have the Brightening Eyeshadow Quad in Butternut. Honestly, these are so much better than I expected, especially with a base (like their all over color sticks!). It's nicely pigmented, I was kinda shocked it was a buck, but then again I only have their Butternut e/s so I can't compare with their others.
I only have one of their blushes, the one in Glow. That being said, I have like 3 of them for backup when I run out. I LOVE and ADORE their Glow blush. It's so pretty, I try other brand's blushes but it doesn't give me that GLOW that ELF's does. I haven't tried any of their other blushes though, but the one I have is my HG for sure.
I also found this interesting video comparing their Studio Blush/Bronzer Palette ($3) to NARS, really good dupe:
YouTube - E.L.F. Studio vs. NARS Review and Comparison
Their mineral stuff is pretty good, too. The Mineral Concealer though is just WAY too light, and the foundation is somewhat sheer and there are only a few shades to choose from, but it's really good stuff for 5 bucks. Their Mineral Booster is like someone stole Mineral Veil and put it in ELF packaging, it's so good at controlling oil, and their Mineral Eyeshadows are supposedly amazing, especially $3. Their lipsticks are also really good, but that's prolly cause they charge 5 bucks for it instead of the usual dollar.
Anyways, that's my 2 cents.
There's some really great stuff hidden in this brand, hope I helped! Good luck!