Really digging it so far... I think it's a tremendous improvement over the first Wii Fit game. I bought a $15 balance board at gamestop, and I have the pedometer on it's way that I ordered online =D
It really depends on how you use it... all the activities are short in length, but you add them up together you can get a very decent work out.
I love that it has the preset work out routines, but even better you can hand pick the exercises and make your own list. It will tell you how many minutes and how many calories for what you've built, and it will go down the line automatically until you are done.
Some of the "exercises" will not really work you out at all, but are still fun and are honestly better than just sitting around (standing still burns more calories than sitting or laying down lol) but others can be very good depending on how you approach it. I do know that I have had sore muscles each day after exercising so something must be working.
The major cons I can think of... sometimes it's a little crazy having to juggle all the different accessories for a little work out routine. You really need the gamepad, two wiimotes, and the balance board for everything. Sometimes the balance board acts wonky not sure if it's just mine, but that can be annoying. I keep thinking though at the gym you could have similar aggrevations, but the biggest plus of the gym is that you can exercise way longer than what the game will have you do for one activity (You could do 100 push ups vs 6 that the game has you do for example)
A lot of it is a ton of fun though! I love the scubba diving game, the yoga and strength exercises, the dances, and many of the other mini-games that get your heart racing =)
Hopefully my love for it keeps up because it's the first time I've been excited to exercise in a LONG time... and I still need to check out the online features I have no idea what's going on with that!
I think the best thing they could do with this game as well, is to make a calorie counter / diary for what you eat. It seems like it would tie in perfectly with what it has already, and it might have it and I just missed it? And then add the calorie counter as a cell phone app that is integrated oh that would be heavenly ^_^