I have gotten it. I racked up almost two hours' worth of Fit Credits tonight :)

There's quite a bit of extra stuff. It integrates seamlessly with Wii Fit, so now there's no real reason to use the original Wii Fit disc.

• Extra balance games, extra cardio stuff, some extra strength training.
• It now estimates the number of calories burned.
• You can add pets :)
• There is group mode (haven't tried this yet)
• The games make you think a lot more. Adding up numbers, tilting your remote one way while you lean another way. It's like walking and chewing gum on steroids.

We got it at Costco for $18. Well worth it if you're a bit bored with the original.

I think it is worth getting the update even if you are new to Wii Fit.

• The ability to create your own workouts makes it easier to get a good program going.
• The ability to do a quick check-in is a wonderful time saver. In the old system, you had to go through the whole weigh-in and test. Now it is a very quick process to track your weights.
• There are memory tests during the running exercises, which are very good for some of us!