Is JailBreaking a Good Idea?

[Apocalypse]

Iv'e got a list of downsides on why not to jailbreak and why you should:

First Downsides:

1. You get a slow idevice.
2. Very minor idevice virus infections.
3. Tons of Application crashes.
4. Low battery, possibly finish in 40 minutes if charged at 100%.

Good Things:

1. Customizable Themes
2. Cool Applications, such as Anonymous. (Email Anybody using a Fake Email that could even be taken! Like I could email you as john123@gmail.com)
3. Nice tweaks, edits and hacks for your idevice.
4. You'll have a fun time with it.

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Of course you can. Thats with the restore! Great feature, gotta say.

You left out free applications which is the main reason besides the customizable themes people jailbreak an iDevice.