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Do you think it would be safe to install it on my everyday device?

By beta 3 things are usually pretty smooth (from my experience at least). I would wait and check with other devs how buggy it is. Based on iOS 7, the first two had bad battery life / instability until a little later in the beta process.
 
By beta 3 things are usually pretty smooth (from my experience at least). I would wait and check with other devs how buggy it is. Based on iOS 7, the first two had bad battery life / instability until a little later in the beta process.

Well, I'm hoping iOS 8 doesn't introduce any bugs that would make the device unusable every day.

I'm tempted though!
 
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