Think to yourself 'why have I chosen OATS?'. Check that your reasons are valid.
Are they any better than other providers? I have seen evidence that they are no better. My only contact with them was talking to their answering machine, as they never answered the phone or returned my calls, so I cannot compare directly, it has to be your judgement call. They claim to improve employment prospects, but how is that claim substantiated?
Check out some of the other schools, SFT, BAe, Multiflight and Cabair but also those that only do groundschool, then fly elsewhere. If you want information about SFT email me (same goes for all Wannabes!).