Do a search and you'll find lots of information on here about ATP. The Aviation Mentorship group on Facebook too.
Pros:
- financing
- speed (6-8 months)
- mostly good equipment (g1000)
- planes are well maintained
Cons:
- they will ram you through even if you aren't ready as mentioned above. This causes higher than normal checkride failures
- they are soulless greedy bastards
- they only give you a paper thin level of knowledge, just enough to pass. You'll feel inadequate when you meet pilots from 141 schools