There's not a lot of resale value in them. My brother did a couple, got Webb Simpson, Ben Crenshaw, and Truck Robinson. I want to say the Simpson sold for like $30, Crenshaw $20, and Robinson $5-10, but that was months ago. I know he didn't get half his money back on any of them. If you're doing it for fun, who cares, go for it.
To answer your question... some are PSA/DNA, some are certified by Leaf, and some have both.
As of 8/1/2015: I will not spend a penny on Panini products at any level until they completely change the way they do business. No cases, boxes, packs, or singles.