I felt the same. The wii fit was fun, but didn't get my heart pumping IYKWIM.

I bought the Active at EB Games for $74. They price match, their original price was $99.95 but they matched JB Hi-FI for me who had it on special.

I've only done the first day so I haven't seen all that it does yet.
But today I did squats (man do my legs burn now!), lunges, rolling biceps, running, in-line skating (which is basically squats, but holding for a long long time), boxing which includes punches, kicking and kneeing and a few others that I can't remember.

I don't think it weighs you, at least it hasn't me. So I still use the wii fit to weigh. It does ask for your weight though, and at the moment I've started a "30 day challenge" with it. So maybe after the 30 days it will ask me for my weight again?