ios 8.1.2 Jailbreak pros and cons

Can anybody help me?
I have iphone 6 with ios 8.1.2. Now thinking to jailbreak it as i haven't updated it to ios 8.1.3. But is it worth to Jailbreak with ios 8.1.2?
Is it true that jailbreak significantly affects batterylife?
Does once jailbroken phone leave a permanent jailbroken mark on itself?
Do jailbreak affects the speed and performance of the phone negatively?
Can anybody inform me drawbacks of jailbreaking?

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