I've attended the same 2 day class thru NOLS and, I can honestly say, you will leave with a more detailed understanding of why specific decisions are made. That, for me, really helps with retention.
IF you are hesitating, for whatever the reason, don't.
Do get plenty of rest though...they work you tail off and the first day goes well into the night.
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Thanks to Tom and Courtney for a job well done.