I don't have any personal knowledge of ATP Flight Schools, but I have never heard any positive things about them. In general what I have heard is that they don't deliver what they promise, but keep in mind this is not first-hand information.
I live in N.E. Florida and can recommend a local flight school - Florida Aviation Career Training (FACT). I know the owner and he has a very good reputation at our airport (St. Augustine, Florida KSGJ). This airport is about 45 miles north of Daytona Beach.
Florida Aviation Career Training, Inc.
If you have any more questions please feel free to PM me, and good luck.