Too afraid to do this to my jail-broken 4. I am reading horror stories about them getting "bricked" during/after the upgrade.
My wife and I share our Apple ID for movies and music. But now we can assign on and see each other's text messages that we send and receive. Bit of a lame feature. Now I will simply not text people because my wife will have the ability to turn on texts on her phone of my number unknowingly.
I like it. Could've gone a little edgier on the design, but it is easy on the eyes, and fairly easy to read as well.
The dynamic text sizing in the settings menu lets you choose more than just 3 sizes, which is nice.
Finally a built in flashlight, which is epic.
Other than that, same old.