Wii Exercise Programs?

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Been seeing a lot of ads for Wii Fit and Wii Active. My family just got a Wii in December (Okay, I'm a little behind), and I'm wondering if such games are beneficial, or just a lot of hype. (Can GAMES be real EXERCISE?) I don't have the money at this time to buy the Wii Fit/ balance board just yet, but what about the Wii Active or Biggest Loser games that I get the impression can be played without the board? Just wondering what others think...

Looking for some variety from my treadmill and exercise bike (and I do one or the other - or both - daily)