Obstacle Course/Races? Rugged Maniac?

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Hi all! Just wondering if any MFP folks participate in the Spartan Races, Rugged Mountain Races, Rugged Maniac, or similar. I want to try the Rugged Maniac Race in MA this fall and want to hear real life feedback about your experience, how hard the course was, etc. I'm an ex-runner, and will get back into it to train for the race, and still consider myself pretty fit, but the suggested training regiment for the Rugged Maniac course is crazy! I'm excited and nervous at the same time. Would love to hear your story.