Does it worth to update iphone 5 from 7.1.2 to 8.3/8.4?

So my iphone 5 is jailbroken and i want to update my phone to ios 8 because the app i want o download need ios 8 above. So does it worth to update to ios 8.3/8.4, does it have any lags on iphone 5? Does it drains a lot of battery?

Yes. The 8.0 update has many advantages that an iPhone 5 can use. I would say that the 7.0 is lame compared to the 8. I highly suggest doing it, as long as you have enough space.

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