I have done Weight Watchers in the past and found it quite helpful but really all the information you need is online. For example, you can get a list of points for different foods and you can get information on how many points a day you'd need based on your weight. So I would never recommend paying for the program because it's the basic knowledge (eat less = lose weight) like Omega said you can gain all the essential information here on this site.
However, the big thing is that WW does not consider sodium, types of fat, protein etc when calculating points. So please, anyone doing the program, consider these things in the kind of food youre eating.