I used this stuff all summer in the scorching heat, through all the sweat and humidity and I really loved it. Paired with a primer it never budged at all, no flaking, no smeary mess, nothing. It looked pretty good and the blackest black was really as the name says lol. I dont know if I wouldve liked it without primer, but otherwise I loved it and will probably get it again. I used the not waterproof formula too. And it wasnt the tiniest bit clumpy until 3 months later, but thats when I usualy replace any mascara anyways.