I don't know what the big flap is, and I have not tried any. You really couldn't pay me to use one of those pore cloggers on my very tempermental acne-prone skin. I have found that products that try to do too many tasks at once...usually fail to do any of them well.
I do not wear sunscreen or moisturizer on a daily basis. They ALL break me out. Plus, it's a big myth that the sunscreen you apply in the morning is doing anything for you in the afternoon. It just doesn't last that long. For days that I'm going to be spending a lot of time in the sun, I rely on a dedicated sunscreen that I re-apply frequently. For daily incidental protection, though, I rely on shade and mineral makeup (which contains a natural physical sunscreen that my skin tolerates very well).