With the exception of emergency updates pushed out to resolve egregious bugs at the initial launch of a phone, I have never had an Android update that improved my device's performance, e. g., signal strength, etc.
Use to eagerly anticipate the newest whistles and bells and complain about Verizon's tardiness in releasing the newest Android iteration. But as has been pointed out here repeatedly Android has reached the point where the latest version for the vast majority of people doesn't do much but cause conflicts with existing apps.
Bottom line: I'm happy with the os that came with my Note 3 at launch, 4.3 didn't add anything to the experience (except provide a message that my Internet connection was unstable), and no longer will Verizon's glacial pace interfere with my enjoyment of a pretty great phone.
I'm sure I'll download KitKat when it becomes available but I doubt it will enhance in any measurable way the pleasure I have in using my phone. I probably sound like the old guy yelling at kids to get off his lawn, but for me there is no longer any point in wasting energy over Verizon's incompetence regarding the updating of its hardware.