The problem Is ATP no longer offers the cfi classes unless you are in the "pro pilot" course from the beginning. I'm not sure about students who went there for all other ratings...have to call them.
Anyways...Sierra will train you for free. Feed you for free. House you for free. Then pay you $17-$20 per hour to instruct with an average of 100 per month.
I have not done this yet, but financially it seems like a decent gig. I have talked to a couple Sierra instructors on here that say its a decent place and is what you make of it. And there are the ones who say they hate it. The ones that hate it have mentioned the area, management, and students as down sides. The area isn't fun (I've been there). The students are foreigners that may be hard to communicate with. And I'm told management can be grumpy if you make them mad. Such as, not giving you enough students so you only fly 30hrs per month.
Someone on the other thread mentioned a $250k fine from the faa for not complying with an AD. Even if it is true, don't let that scare you. Those sort of penalties are rather common. Heck, do a google search of the faa fines that ATP has received....I dare you! That can be something as simple as miscommunication. Or as bad as just ignoring the faa...who knows. As an instructor, YOU are responsible for checking your airplane for legalities and compliance.
All-in-all, based on my research of the place I am strongly considering it. I recommend researching the area and look up reviews for the school and make your own decision based on what you need/want.
As I mentioned in the other thread, I have the training contract if you want me to email it to you. It goes over how much they will charge you if you left. Goes over pay, and all that good stuff....