That Gal does what it says on the tin, it brightens your complexion and gives you that lovely "lit from within" glow. Although it doesn't claim to, this pearly peach coloured silky primer also creates a beautifully smooth base for applying foundation over. You can also use it over foundation as a very subtle, dewy highlight. I love to lightly tap it over my cheekbones for a healthy glow, if I don't feel like using a more pronounced highlighter. It also smells amazing, but I can't put my finger on what the scent is!
I can't really fault That Gal, except for the price tag. I'm sure you can find something similar for a cheaper price, but £22.50 isn't completely unreasonable for a product you love, you know? I would totally recommend this if you are in the market for a brightening primer!