Something to remember: Norton updates still continues that "bug" when you do it manually. You don't receive all the updates, it comes in parts, so every time you click to do a Live update it comes with new things to download.
But the automatic update is smooth, you don't even notice Norton is there. I never experienced some major bugs like people had with Norton and Windows updates, I will tell here if I see it.
When a new version comes, Norton asks you to apply the patch, restarting Norton services without needing to restart Windows. In that case, I like Kaspersky more because it download and it wait the computer to restart to apply the new version without asking the user.