It's really good... I run it on my computer and we put it on all the computers we build / ones that don't have antivirus at the shop I work at. They update it at least once a week and the program itself has a really low overhead (that means it's quick and doesn't kill your system during the scan).
Ewido is more of a spyware hunter than anything. So naturally that should not affect each other. Ewido is a major part of my everyday job and just about every tom dick and harry has norton... Never seen a problem.
I have had AVG running synchronously with Norton on one of the computers I was working on, once you get the permissions sorted out it works fine.
Although you may not have heard of Grisoft,I believe AVG is superior to Norton (aswell as AVAST). It has a very low overhead as stated before,so its not going to get in the way of your everyday activity.
The best of the best though (In my opinion) is NOD32. I just like it more than all of the rest,it's on par with AVG aside from more frequent updates.
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