I am unsure if I would ever use PF before.
But I used to be a believer in PF. Since they rated as 4/6 in terms of cut and gloss.
When I used it on my brand new white tacoma truck early this summer to prep it for coating. I was not informed that it had SUPER DURABLE FILLERS.
After I polished my entire truck with PF, wiped down with carpro eraser and gtechniq panel wipe, I coated it with gtechniq c1 and exov2. And it has been 3-4 months now, when I wash the truck, it is still beading and sheeting like crazy, no sign of wearing off or anything. So I am safe to say the coatings did bond properly on the paint.
I honestly don't know if there is fillers or not, because I didn't really test it out or have a panel I can try it on. But I suppose I could do some experiment about it.
But the reason I go for PF is because it doesn't gum up or dust like MOST other compounds. And it gives me enough cut to remove majority of my swirls and what not. I have tried many different compounds, and they all gave me a good amount of dust everywhere, and it is just annoying to me.