I had problems with the 4.3 ota upate. Had screen flickering, especially bad when running chrome browser. and the pulldown notification shade was down and dimmed the back screen
random reboots, freezing. tablet was practically unuseable.
flashed my original firmware back over and all was working great again.
tried again with 4.3 and back to the same antics with it.
I have however reflashed a modified 4.3 with super user root and recovery built in and can say ive had no problems appart from occasional excessive battery drain from the kernel, a reboot usual fixes it.