Should i update my iphone 3gs to software 6.0.1?

It is now currently on software 5.1.1 and my friend told me not to update it because it would become very lagging and slow I don't know weather i should?

If it is unlocked and jailbroken then definitely not, my partner has just done hers and it has wiped it completely and can't jailbreak it now, need to go back to original provider and start afresh,(was bought in America so going to be a lot hassle)
Beware.

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