Please go to your preferences page and make sure your "See Mature Topics" setting is set. Setting it to "Yes" means you see the Mature Topics forum (contains political and religious debates). Setting it to "No" means you do not see those threads.
I would say that they are worth it mostly because sizes can be a little weird on diapers. It could save you a lot of money if you try the sample before buying a whole bag. They do come in a plain box that nobody is going to think twice about.
As for which one to pick, try a few. thats what a sample pack is for:smile1:.