In my opinion, EVERY school will tell you that you have a "good" chance of getting hired if you train with them. They will probably tell you there are no guarantees, but that they've hired many former students. Now, that is the truth (WHEN they have open positions).
What they won't tell you, is that if it's a small school (2-3 CFI's) and they have a full staff... it aint going to happen. Timing is everything. When one of their CFI's is at 1000+ hours, then you have a better than average chance. That doesn't happen very often with small schools.
Larger schools (Votex, HAI, etc) have a much higher turn over rate, because they have a lot of instructors, a lot of aircraft, and a lot of students. AHC (Frederick) has 2 full-time CFI's... sometimes more in the summer months. I don't know about the others.