You've installed the software, and judging from your responses in the installation thread that went smoothly. Now we would like to hear about any performance issues - has there been any apparent effect on the way your machine runs with Norton 2012 installed?
My first scan took just over 2 hours for 2.5 TB which seems like a long time to me but having not used Norton for some time it is hard to comment. Nothing was found. Occasionally I am encountering error 8921,251 then it tells me that the Symantec Service Framework is not reporting and I have to close the program to get rid of the warning. Whether this is a Symantec issue or my lousy Broadband service playing up I am not too sure. On shutdown my PC has slowed from about 12 seconds to around 45 seconds.
As this is a specific question my answer is that there have been no performance issues. I was running NIS 2011 before the test, and can see no difference in my computer's performance.
I have had a couple of other issues arise which we can no doubt discuss later in the test.