I went in with a PB once, and the genius helping me told said "Cool, I have it on mine too!" I don't think they really care...
Yep, can vouch for this.... I had taken my iPhone 5 in once for battery issues and had an iOS 8 beta installed on it. The genius helping me had it on her personal device and spent most of the time talking about how cool the new features were, what I liked/didnt like about, and repairs were done without any issue.
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This is probably not the appropriate thread for you to be hanging around in, muchacho.I swear if I ever hear the term ' Dailey Driver ' again, or super this, super that, I will go mental.