I went to ATP, and I loved it. They don't hold your hand. I was in the short course for instructor school, and I ended up getting about three weeks total for all three CFI rides thanks to the 4th of July holiday, and a hurricane that closed Fl down and backed up other checkrides ahead of me. They don't hold your hand. They are there to fly you, and get you into self study mode. They know what the checkride consists of, who the examiners are, and what they'll ask. There are gouges for all of them, and they work.
As for instructing there. Do it. They have housing available for the instructors at a very reasonable rate (if you need it), and you will fly your ass off if you are in the right location. Make sure you are at a school in the south. Phoenix, Dallas, Fort Lauderdale, and Atlanta all fly a ton. You don't want to go up north where you won't have 300 VFR days a year.