I did it once. $5.00 to start, different block every month, didn't pay more if you kept up. Given a choice of 2 color schemes up front. This was offered twice each month, and you could attend either session, so it wasn't too difficult to attend the 'class'. It did introduce me to some of the gadgets available, although I didn't buy them. And also got a few pointers on block construction.
But -- my completed blocks are just that -- blocks. I have yet to sew them together. Another UFO.