To be honest, I am not completely sure where I stand on Vista even going forward with a release of SP2. While it is just around the corner and SP1 did do wonders for driver related issues, SP2 suddenly feels unneeded.
Now even with this being said, there is obviously an advantage to Vista users interested in making sure they are secured against the latest threats by being sure that all of the critical patches and driver updates are included in one powerful release. Service packs are helpful in this respect, no question.
Still, I believe that this SP will be a mild fix to the issue plaguing Vista from day one. It is a resource hog. What, update to new hardware? Sure, blazing-edge machines do certainly perform well with Vista, but Netbooks unfortunately, really need the performance improvements given in Windows 7. And that is just what I have been experiencing, your mileage may vary.