For many years I have been filling in my brows to give them more definition, whether it be by using a brow pencil, a brow kit or just a plain brown eye shadow. I've tried out so many brands and products in this time most of which I've been happy with but the HD brows palette has to be my all time favourite. I do still love the Sleek Brow palette however the main difference is that in the HD brows version the shade that I use (bottom left hand corner) is a cool toned ash brown rather than a warm orange brown which I much prefer. I use that shade to give my brows definition and then go in with the darkest shade to fill in any gaps and sparse areas. The pigmentation of the shadows is excellent meaning that the your brows look great all day long. It may be pricey but I can imagine it lasting for years as you only need to use a tiny amount on the brush for each application. The only thing I'd change is making the angled brush slightly softer as it's quite brittle and dense.