GG,
Thanks for that vote of confidence.
SP3 Beta did not work for me. The Beta version was about 370Mb whereas the release candidate was said to be a lot slimmer. I ran the install but the system then crashed. I had no need for SP3 so I reverted to SP2.
From what I was told, the only advantage of SP3 is for reinstalls as it sweeps up the earlier changes from SP1 and SP2 and the various patches since then. As it is patched to a recent standard reinstalls will be quicker.
If you have SP2 and are patched up to date then you are already at SP3 standard.
Well, that is what I was told.