I've flown at NAC. Pretty good school. Nice location, good facilities, good a/c etc.
I might be a bit hesitant to go with them for ATPL ground though because most of the instructors are young, inexperienced (wannabes like ourselves) and largly foreign (not that there's anything wrong with that but they might have problems explaining things in clear english). But as already said the first lot are still working through the course so it's too early to pass judgement.