Everything I have heard about SP2 is that it sucks, nothing works after the installation, and if it does work, everything works slower and stuff..
Except myself.. I installed SP2 a couple of days after it was released on my Dell machine, and I havent had any troubles what-so-ever with it... Except for the security center bugging me that I didnt seem to have any antivirus software, until I figured out how to turn off the warnings... :-)