The upgrade went OK for me too.
However, I still cannot get HDMI output working. It worked (via a 3rd party Ipad to HDMI adaptor) for about half an hour, then stopped. A different adaptor did not help and neither did the firmware upgrade. There is a fair amount of stuff on google about this, but no solutions. There is no obvious config on the Ipad which might control whether the screen (Iplayer etc) is copied to HDMI or not.