I have also used some of the Models prefer line, and it wasn't bad. I got a lot of good deals on it, when she changed to YBF.
I liked the brow pencil, but have had some of them defective and I think they are expensive. I don't see YBF as anything special, but have nothing against it.
I use Two Faced brow kit, and like it alot.
I use SCA products, but when it comes to eye shadow, blush, bronzers, and alike, I use Two Faced always.
I love the Ybf powder (the yellow one) I have been using it since models prefer (her line from QVC before they parted ways). It really does what it says. I am also addicted to the bronzer, for my $$ it is the best color out there. It never looks fake or orange. What I really enjoy are the application tips, google her name and check it out on you tube.
I have been using Stacy's brow pencil since she first presented it when she had Models Prefer. When she changed channels & name I went to her website & bought 6 on clearance. They last so long I still have 4. I also purchased her yellow powder compact & use it to set the brow as she suggests.