I only have one US-Formula Quad, Mystere, of which I didn't like the formula very much (I found it to be too powdery and hard to blend), but I know there are better ones out there. I tried only two quads until now, Venitien and Gabrielle, with me there was no fall out, really like zero, despite applying the metallic taupe shade all over the lid. Longevity was also very good, applied around 8 am, lasted until 8 pm, that was when I decided to remove it, I carefully checked under eye area and my glasses (which is very important since sometimes eye shadows migrate to the glass lol) and there was nothing. Needless to say, I am impressed so far.
I was wondering, do you know what happens to US quads? Will they be replaced too? I have seen Mystere has Talc in its ingredients, so it tells me if this is a decision of Chanel to go talc-free, these should be reformulated too.