Maybelline Volum'Express One by One Mascara

I tested the Volum'Express One by One Mascara from Maybelline in blackest black, which promises more volume for your lashes without clumps. Their campaign shouts "finally, bold without the bulk!'
I liked the mascara, the color was black enough, the brush felt good and was good in use, but I have to admit: there were still clumps in my lashes...
But: I have noticed more volume, but ofcourse not as much as their promotion pictures show, but I thought it was enough for regular use (:

http://www.maybelline.com/products/109/eyes/mascara/volum-express-one-by-one-washable-mascara/blackest-black/000?shadeId=575