Recently bought this due to reviews here. I absolutely LOVE it. Makes my VS foundation stay on & not look blotchy during the day. I use it in addition to the VS Pro oil blotting gel & the eyeshadow primer. I have very oily skin in the t-zone & have always had problems getting makeup to stay true at least from morning until noon, but w/ the VS combo that I'm using, everything stays acceptable even until dinnertime! It even gets me through my high intensity workouts at the gym, which other supposedly "long-lasting" makeup has not managed to achieve.
My sister used to write beauty articles for a fashion mag, so she would get a lot of excess product that she'd send to me, so I've used a lot of the $$$ primers & foundations out there. IMO, VS Pro line holds up at least as well as many of the big-name brands, but the price is much better. Good value for the product.