I used the CATS material, and it was fairly straightfoward to be honest. That said, I did fail PoF the first time around. Mainly because it's such a short exam with few questions, hence easier to fail from a percentage perspective.
I'm always intrigued as to the purpose of PMs in such a thread. If you've got information useful enough to PM, why not post it? One can only presume it's a link to a dodgy Oxford torrent or something.