Got this last week, been doing for the last 5 days, and it is very good. I tried Wii Fit, and a couple of other similar games, but this is the best of its type by miles.
I was a bit skeptical about what could be done with the ring, but it‘s a really clever accessory, imprssive how many different exercises are possible. Even the resistance of the ring is very cleverly set up so it works for just about everyone. The adventure game aspect is pretty simple, but good enough to keep the exercise interesting and varied, and some of the mini games I have played so far are good in their own right.
I haven’t been doing it long enough to notice any weight loss, so no idea if it is good for that, but it gets the heart pumping and I work up a sweat, so it must be doing some good!