All schools and certifications serve a purpose and can help you in some situations but what it boils down to is if you do shit work you will be found out and let go anywhere you go , here in Florida most shops do not give the first hoot about schooling or certifications because it does not mean you are a quality installer being a quality installer comes from hands on experience and also being able to do it the way the shop wants you to do it, another words if you are not a team player most shops will not keep you around for very long.