If it ain't broke don't fix it !!
Just some thoughts...
When i got my n8 last year it came with the original s^3 software and all worked perfectly
I updated to official anna via pc when it was released and had lots of problems
Got a replacement new unit from orange which came with anna factory installed (lucky) and has worked perfectly since
Now we have belle update available !!
So the question is - should we update or not? It seems from forums that people have lots of issues after updates to existing software so is it best to leave your phone untouched with its original clean factory installation?
Does a clean factory install on a new phone work better because of no previous files etc and therefore no corruption issues?