In WPCentral they made a poll asking this. 80% already installed the update, another 10 is just waiting the dust settle down to jump in. Another 10% prefer receive the update when the carrier deliver it.
I need to confess that I do like a lot of the update. My wife saw just the new background and said "I want it too"
But I'm missing the way OneDrive and Facebook use to be integrated. Maybe they will change with new versions of the apps. But I'm missing see pictures from Facebook and OneDrive right away. Open the app is somewhat disturbing. Strange they didn't messed with twitter integration.