I have been usinh this phone from past 2 years and till now I have not even faced even a single hang issue.
At times I have used more than 11 simultaneous working app. Almost 300 days a year I have more than 40 apps installed on my phone including games like asphalt 8 and BIA3 of 900mb each.
Battery is superb and so is the user interface.
Totally awesome phone.