Zumba!

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Studying for my last exam before the break which would explain my nocturnal tendencies.
Anyway, this evening, after a couple of recommendations from people on this site, I bought the Exhilarate Zumba Fitness 8-DVD set (which also comes with 1 lb Zumba dumbbells). Can anyone justify whether it's a good program or not? I'd like pros and cons from anyone who can give 'em! Thanks.