There are just too many variables for MS to try to achieve 100% success rate with a deployment this big...
The main reason to drag your feet on the install is two fold:
1. The more ppl that install and relate thier story.
2. There are only sooo many support channels, the sheep will be installing it first because of promised security measures. So they in turn will be sucking the life out of existing support channels.
there's nothing in this Service pack that'll print money, so ...unless you HAVE to install it for some reason, I would wait til the hubub dies off a bit.
