I belong to Curves. I pay $30/month, but it's a yearly contract. I think there was a fee when I signed up, but if you watch they have 2 for 1 specials on those.
I really like Curves because I can change my workout to be as light or strenuous as I want. It isn't difficult at all. When I first started I was VERY out of shape (could hardly walk up my stairs with a basket of laundry) and weighed...um...a lot more than I should. Okay, I was 248. I was way too embarrased about my weight ot go to a "traditional" health club, with all the size 4 beautiful people. My local Curves is full of middle-aged Pooh-sized people, who were warm and welcoming. I miss seeing everyone when I don't go. I still don't like exercise, but Curves is something I can stick with. I am now down to a size 12 and can carry the basket of laundry up the stairs and all the way back to the bedrooms without any effort
You will find others who say Curves was not for them. I say whever exercise you find that appeals to you, go for it. For me, it's Curves
Laurie