Is it a bad idea to jailbreak my iphone 4s?

I think the idea of jailbreaking is cool and want to do it but i'm afraid that i'll loose my pics/music and anything else on my phone. What are the pros/cons to jailbreaking?

YES! It will DRAMATICALLY slow down your phone and overall just isn't worth it.

You won't lose anything of your stuff just all your apps i jailbroke mine, i was scared of losing everything but i didn't i just lost my apps, but it was all good at first but now i regret it, it made my iphone super slow! It freezes a lot i have to restart it 5 times a day, i no longer want my iphone because of that

Bad idea, it slows it down and makes it unstable.
not worth it for a few free themes and tweeks
also your will void your warranty

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