Yes I have flown at NAC, and can say I thoroughly enjoyed it. I believe their ground school only started last Sept, therefore the first class is yet to complete all 14 modules, however, from what I hear it seems pretty good.
From personal experience, if you are considering flying with NAC, I could not really fault them, aircraft were readily available (as long as you organise yourself and book them), instructors were helpful and approachable, and Mr Clegg was keen to organise football matches
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If you require any other info, send me a message, I will be more than happy to answer any questions.
Cheers.