Advice on Jailbreaking my iPhone 4?

So I have an iPhone 4 and I really want to jailbreak it. But I want to know the pros and cons, things you can do when it's jailbroken (other than get free apps), and good programs to do it.

If you get it jailbroken, you can customize your background and wallpaper like the slider, battery, and icons can change.
However it takes more battery, I heard sometimes if it gets dropped it won't turn back on, its illegal, if you do it wrong your iphone won't work at all.

I suggest you to see this
http://unlockappledevices.com

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