I have used her products for years. She has saved me SO much money. Since I don't like shopping online that much, I also purchase items she recommends on her Beautypedia site from the Drugstore (products that are just as good, if not better, than the much more expensive alternatives in Department stores).
My favorite items from the Paula's Choice line are the toners, BHA9 serum, Antioxidant Serums, and Brightening Serum.
I love her skin care items, but I'm not much of a fan of her makeup. I do use makeup she recommends from the drugstore.
The advice in her books, Facebook page, and website are very useful too!