My husband and I went to BlueGreen in Plano this year, and if we hadn't felt like we were being hit from every direction with our bills, we would've bought with them ON THE SPOT! They have locations across the country, and you are not "tied" to just one area when you want to take a vacation! My husband works in the hotel industry, and he was very impressed by the company (which is very hard to do!) If your timeshare limits you to *just* using the Orlando Horizons, I would seriously reconsider. Orlando is great, but so are other areas in the USA :)
(BlueGreen also has resorts in the Orlando area, too.) We loved the fact that we could "buy in" at BlueGreen at a lower level timeshare, and then upgrade to a higher level at any time in the future. We were told most people do so within their first year.
Hope you get all the info you need to make the RIGHT decision for your family! :)