Went to Ari myself...have nothing but good things to say about it...and you can get it done in 5 months or less. 5 is kinda the norm. Fast isn't always best...and having a little bit of room for extra study is nice. But you can do it in 90 days if thats your learning style and you can retain it.
Can't speak for ATP...never went there, but did have a lot of students come over to us from there complaining of bad instruction. However, that's just the people I've come across...there are people who are happy with their training their.