What are the pros and cons of jailbreaking an iphone 4s?

I would like to jailbreak my phone for cool settings and effects. So what are te pros and cons? Also how do I jailbreak my phone?

Pro - Everything is free
Pro - If you jailbreak using green poison the start up apple turns into a skull

Con - Installation programs such as installus can take a while just to even get to the download page (So many codes and **** you have to fill out)
Con - A lot of downloads are faulty and may not load up and take up memory

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