Well, I was not having the issues that this update repaired, but I always keep my computer up to date. Here is how my machine in focked up now: 1. Runs 20 degrees hotter where I can not even use it on my lap any longer. 2. The percentage charged was reading 100%, now it was reading 99%. I tried to reboot it and now it just sits at 96%. Under power in the system profiler, the remaining charge number has dropped significantly in 2 days. 3. Ability to control the fans either with smcfan or the fan pref pane is limited. When I make a change, it either does not respond or takes upwards of 1 hr to make the change. I am very upset and I am in the process of contacting my mac genius friends!