My LQS has one each year and they are a lot of fun. It's usually a specially designed top. I believe we paid 29 up front and then it's free each month as long as you bring in the completed blocks. She shows the blocks you will be making and gives tips on the piecing - sometimes there is a little demo on a technique. We always have show and tell during the 45 min and she tells us what's coming up in the shop, etc.
Mine is not finished - boo hoo. It's a large quilt and I decided to make 2 small quilts out of it for my grand daughters since they are pink and brown and very girly. I'm in the process of making some extra blocks and then will piece the tops together.