I got my CFII through American Flyers. It was a good program and I was well prepared for the check ride. I had the opportunity to use the Frasca 141 FTD frequently and got a fair amount of practice that way. I have no complaints about the training. I taught there part-time (ADS), then full time (ADS & FTW) about two years later.
The financial part is a different story. I paid up front and flew against that amount for eight weeks. At the end of training, with my CFII temporary certificate in hand, American Flyers owed me over $700 of the amount I paid them up front. It took several concerted efforts to get that money back.
If you have the money to pay up front...don't! Put it in a seperate checking account (interest bearing if you can find one!), then pay as you go. Any interest paid goes to you, not American Flyers.
If you are planning to fly at FTW, beware of Billy Fulton. He'll make things sound much, much better than they really are. He's a consumate used car salesman, and one of the biggest bufoons I've ever known.