What are the "real" advantages of being certified? Has it helped you with your HVAC career? I see there are multiple courses and study material cd's, books, seminars...is there one Nate certification which is better than another...I see a core exam and tons of specialty exams, is there one you recommend for a first year apprentice. I have heard some guys say its a gimic because you continuous have to take CEU's to keep the certification. Others have it said "its the end all be all", whats your real thoughts on NATE certified and your HVAC career.