Personally I wouldn't install SP2 for another few months or so. I'm a computer tech and I've been using it at work everyday since its been released on the Windows Update site. It has already crashed alot of customers computers at work. It installs and after rebooting, thats it, crashes. No way to fix the crash either except reloading the OS. It particularly crashes SATA computers. Dont ask why because I have no idea.
Also a couple of more programs I know off hand that say they are incompatible with SP2 after its installed:
Easy CD Creator 5
Nero Burning ROM 6
When you open those 2 programs after SP2 is installed it says that they are incompatible with your version of Windows.
Now for someone like me, at work its not a problem if the computer crashes, because if its getting SP2 installed, its already there to have the OS reloaded in the first place. It just takes longer to get the job done if it does crash. But for a home user who relies on their computer everyday, has no way to backup data if it crashes, or does not have much knowledge with computers, this can be a nightmare to them.
So bottom line, I dont recommend installing it for a few more months. But its your computer, just my recommendation.