[MovedGoalPosts]

I've not had any significant problems with it. There are some benefits, the biggest inevitably being keeping your machine patched to reduce risks from the inevitable nastys floating around the computing world.

There are a few potentially useful additions, although equally they can be problematic, dependent on your needs. Particularly Ive found that SP2 adds Security Centre (go into control panel). That is the place for setting of further windows update stuff, but particularly windows firewall. SP2 turns that on by default, great if you don't have one, but for me, where both my home or business PCs are protected by a hardware or server firewall, one on the PC as well is a pain, so it gets turned off.

SP2 is a fairly big patch. As such it always has potential to screw up. On that basis before running it, make sure you do have backups of any critical data.