I have just downloaded and installed SP2 and I was surprised how quick it took! It says on the Microsoft update website that it would take over an hour on my 512 kbps broadband connection but it actually took just over 45 minutes! I don't know whether this had anything to do with me downloading in the small hours of the morning!
I was reading loads of scare stories about SP2 and so I have decided to try it out for myself and so far I have found NO problems. Early days yet but here's hoping! IMHO well worth trying out as long as you have made a backup and/or enabled System Restore. CW