My fiance and I are going to look at a few areas in a couple of weeks. Poinciana is one of them. I've visited it before when looking to buy a vacation home. For that purpose I thought it was a little too far out to get top $$ on rentals, but as an area to live permanantly it looks to be worth consideration. We're going to check out the schools in person, IMHO looking at a website or stats on a piece of paper don't really give you much of an idea.
The general views of plus and minus seem to reasonably favourable, there are a few complaints about the area, but not in sufficient quantity to put me off going to check it out for myself.
PM me if you'd like some feedback when I return. We're there from Sept 11 to 25th .