I didn't jailbreak so far, so I am just guessing some cons:
- Potential loss of warrenty
- Can't use iOS updates immediately
- Changes you do to your contacts etc while on jailbreak are lost in case you move back to the unjailbreak version
I'm not sure about the last point, correct me please.
May I ask an vaguely topic related question?
When you do a backup via iTunes, will that backup only the apple app data or all data? Example, all mails in the gmail app are also backed up or not?
I didn't jb yet, but I am really tempted.