Have you tried BeautyStat Cosmetics?

I was on The Tok yesterday, as the kids say, and a dermatologist popped up talking about Vitamin C serums. She had AMAZINGLY clear and beautiful skin, so I really want to trust her, lol. I've used a Vit C serum before and honestly don't know if it really made any difference after months of use. They're also crazy expensive, so I only buy the little travel sizes to try out. Has anyone tried BeautyStat before? Did you like their products? Or should I just stick with The Ordinary or Paula's Choice?