I had selbiges model with Andriod 2.3 and the response times on inputs were in the green zone. Since this fell down (broken glass) I ordered another Samsung Galaxy Ace 2 I8160 and it came with Android 4.1. - Pretty lame. Display setup menu when in contact takes up to 3 seconds. PS: Supplier needed for an amended accounting (new address) 8 weeks - 4 urgent meetings!