ATT G930a owner. Update is very frustrating so far. Don't update if:
1. You are not concerned about it being VERY buggy across a variety of applications and function. Far more than prior to update.
2. You don't care about better security.
3. You like a menu design/graphics that looks elementary over prior version.
4. You don't mind if the keyboard has constant typing errors. Even as I type this.
5. You enjoy listening to music that intermittently switches to pause for no reason.
6. Multi window functionality is not important to you.
7. Easy reading function - blue light - is not important to you.
8. You don't mind telling friends that you have deliberately not updated but they have and love it.