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Well my iPad 4 hasn't locked up since the update so maybe they have finally got it right. Would like to know how the ipad 2/3 are fairing as I have one of each that I haven't upgraded yet.
 
killed my sound, all sound, no speaker working. searching for fix now
 
All fixed. Hard reboots power button and home button did nothing for me, a simple shut down via power button slide to power off fixed.

8.1 seems ok to me.
 
No complaints with the performance of 8.1.1 on an iPad 4 here.
 
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