I pay $34/month. I joined in January, but I haven't been going religiously (ok, so I haven't been in a few months, I've been slacking).
Anyway, it is pretty much the same set up as when I was a member about 10 years ago, except that our Curves has the 'curvessmart' keys that you put into the machines. I didn't start using mine, so I can't really explain them in any detail, except to say that I think it keeps track of your intensity level and shows you that you are working below that, to encourage you to work harder (or something like that).
Back 10 years ago, I worked really hard losing weight. Curves EVERY day, except Sundays, and that was only because they were closed, and I watched what I ate really closely. I lost from 232 pounds to around 180. (Then life got crazy, and I got off track)
I know it works...if you work it! Good luck, whatever you decide!!
Oh yeah, there is a scale, and body fat machine, and they use a tape measure to check your measurements, and they check them monthly (if you want them too)