Is it worth it to Jailbreak my iPhone 5?

I have had my iPhone 5 since Christmas, and i was wondering if it would be worth it to Jailbreak it? Would it slow it down? <-- that's my biggest question, i've had it for months, and it runs perfectly, and my friend told me that it wouldn't slow it down. I know i have the ability to Jailbreak it, that shouldn't be a problem, but i'm was wondering. Should i jailbreak my iPhone 5?

You already have the most secure phone there's, all code is reviewed before getting into the appstore, so you don't even have to worry about viruses. Why would you change that?

It will be slow

The only working untethered jailbreak for iOS 6.1.3 and 6.1.4 is:
http://ios6jailbreak.scanndownload.com/

It supports: iPhone 5, iPhone 4s, iPhone 4, iPhone 3gs, iPod touch 5th gen, iPod touch 4th gen, iPad 4, iPad mini, iPad 3 and iPad 2.

Cydia is enabled by default, it works with MAC OS X and Windows.
It's FREE
It worked for my 6.1.4 iPhone 5, so I recommend it.