The tiny brush prefect fits into the root of my lashes and the curved shape works quite well for my bottom lashes.
The tint is subtle and the mascara glides on extremely well. For someone who loses their lashes quite frequently, the formula seems to give a protective coating to each lash while maintaining the lash's flexibility.
On it's own, it might stand up to being a 'weekend mascara' but for those who need more oomph, you may only want to use this as a base, though the protective and conditioning quality on this is quite nice just by itself.
While this works well as a tint and to help set, it didn't really amplify my mascara that much. I tested it with two different mascaras and there was very minimal increase to length and volume. The Lancome Cils Booster XL does a much better job at amplifying but it doesn't seem to have the same feel. Firstly, Cils Booster applies white (though it fades to clear). Secondly, the formula is more liquid and I don't get the same 'protected' feeling as I do with Lauder's.All in all, this primer is good for those who want their lashes protected and to help set their mascara. It a nice-to-have first step and the water-resistent topcoat effect is an additional bonus for those who don't buy waterproof mascaras (which I tend to do). But if you're looking for something that is meant to truly amplify, you may want to check out Lancome's instead.