Check our accelerated flight school podacst, he doesn't say it but he went to ATP and did not have good things to say.
In my opinion of the school is that they are a pilot farm, they just reach u what's required and don't care if your falling behind. They have time tables to keep to and force you to take checkride regardless of you ability. Also the price is not that competitive to other options.
If you self study well then it is a good option, if you think you will need some more help then I would look at other options.
Don't know anything about American flyers though.