I actually got World of Final Fantasy when it first came out, but I've yet to begin playing the game myself.
My four year old daughter, probably 2 or 3 at the time, did play the game. I sort of helped her along, so in a sense I did start my file. I'm looking forward to the day that I start my own playthrough, as I think the art style is amazing, and I really like the characters. The "helper" character, which I can't remember (was it Mog?), has this cute language nuance where she keeps saying the word "the" at inappropriate times (or maybe it's a different word, I can't recall), and while many probably found this bothersome, I really liked it.
I also like the familiar enemies, locales, and variety.
Fun fact: My daughter calls it the "plushie game".
Edit: How was Type-0?