I made restore point before install.
Install happen with no problem.
During 1st boot, the computer tried to go to "Error Checking", but it stoped so I guess it wasn't needed.
Took forever for 1st start up to happen with all the rewriting of files... For me that was about 4+/-min. My computer will boot from the time of the post screen into windows in around 30 seconds.
Before the complete load of windows I was asked if I wanted to turn on auto update, I clicked no.
Start up screen is the same, color for load indicator is the same, color didn't change like it did when adding the other SP packs.
Unlike SP2, SP3 did NOT turn on the Windows firewall, But my firewall was asking to give permission to "all" the network programs and Explorer, but did not ask for permission for FireFox. So that tells me SP3 has done many changes to the network programs of Windows. No other programs needed permission.
As soon as all my programs were loaded I went to windows update... All of the windows update programs were asking for firewall permission as well... Changes made to Update programs.
No updates were needed after adding SP3 from windows update.
2nd boot... Back to my normal speed of boot time (30+/- seconds), no more no less.
That is it for now... I am going to do a few 3DMark06 test and see what my score is. The internet rummer mill says SP3 gives better performance in Programs, Games, Networking.
EDIT...
3DMarks went from 9115 to 9201. Could be from SP3 or just something different with my system from my last test. In any case 86 points is nothing to jump around about.