Use this link:
http://www.ackermanacademy.org/alumni/
Then when they answer you, get in touch with whoever they put you in touch with. Ask them to confirm or deny whatever you are worried about. When you're done ask them for other names that they would know of. Repeat the process with the new names you get.
After you feel you have enough evidence to make a decision, make one.
There is no "real" information on this board. The BEST you can hope for is getting leads to real information. No matter what anyone else posts on this thread I would seriously consider doing the much more difficult but much more reliable process of actually talking to people who went there recently.