Holy crap nice bump. To answer your question: no, I haven't tried that demo - didn't even know they were making a part 2. You're right - gil would be nice.
What do you mean: "anyone who tried to platinum FFXIII" - I don't understand that.
SO! Now...I'd like to announce that I am completely addicted to this game at the moment. It had been on my shelf for a year waiting to be played and shortly after Christmas I decided to finally pop it into the PS3. I love it. Completely. Unashamedly. Yes, the main character is a 21 year old female, but I can just pretend she's 25 and then pretend I might get to date her, so that works nicely. I also quite like Fang, which was a bonus. The rest of the characters are 'meh' but that doesn't subtract from my enjoyment of the game. It's really quite incredible. I am impressed with the number of simple FFVII parallels, while also advancing the story to a much more complex place. They are telling a rather large story that I don't hate (a nice plus!) and am still intrigued with. I am probably 30 or 35 hours into it at this writing and have just landed on Pulse.
While we're here, to update from my previous post - FFXII was a great game, too.