The only reason I bought this mascara was because I needed a third product to add to my 3 for 2 deal but luckily, I chose a great product on a whim.
The wand is quite large and is made up of fine brushes that comb your lashes evenly, leaving no clumps. When I first used the mascara I was worried that the brush wasn't picking up enough of the mascara to coat my lashes (it does, it is deceiving).
The mascara is light and lengthens your lashes. The effect is pretty undramatic though and it doesn't add much volume. It is the perfect daytime mascara as it defines your lashes individually and there is no flaking. It stays put all day but it is a bit of a challenge to remove (but what waterproof mascaras aren't).
I wouldn't buy this again but only because I like my lashes to have a little more volume during the day or night but that is just personal preference and it is a great product.
Maybelline Volum' Express One by One waterproof mascara costs £8.49 and is available for purchase at all major beauty retailers.