I like it. For us it was quite worth it. I use it everyday to weight myself and three times a week to excercise. My dh uses it to weigh and excercie 6 times a week. When we first got it it was quite fun and exciting to do the excercises in order to open up more features etc.
There are some down sides: it lectures you! As you may know a persons weight can vary + or - 2 pounds a day. Well if you show a loss of 2 pounds in 1 day or a gain of 2 pounds in 1 day the stupid machine either lectures you that you are losing too fast or demands why you have gained weight. Then you have to click a reason for the weight gain. (And I'll tell you right now TOM is not one of the options) THEN it tells you that it is normal for your weight to vary up or down 2 pounds!!!! ARRRG.... LOL.
Overall, for us, the game is worth it!
It has motivated us to lose weight and get in shape. Well worth it!
Check out the WiiFit challange thread in "Chicks up for a Challange" .